Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad6874b32178a93…

MALICIOUS

PDF

92.5 KB Created: 2021-06-26 08:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 018764c9994bc4aba596a3fa0ed31be3 SHA-1: 7c232966d744f1a947dcb5dbd04a0986771fa96a SHA-256: 2ad6874b32178a934231d6358b7e4f824f77173e125682818947de14616784d1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, a technique often used for SEO poisoning to lure unsuspecting users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/95npmpgnmqq6i5jg3ljeie5ac1/60830288504.pdf In PDF document text
    • http://www.hon-ro.hu/userfiles/files/1005320965.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fjnlpp701lop7gqkrcc05eae10/23052157466.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5acb1aae11339b4e87f6442bd8fd4ef4/18172753891.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/85931939085.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bae1c669321---vugukosilajolu.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a820dd7af---59179471804.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/xoderepevovanonopemewibe.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/8d2d3c4085846b116e3924e2faceaf30/48872982754.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/fkaj6u1hm2hbp122p14hu31487/vukajememagivig.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/61933612258.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/73a413385854c2f892183e93b705743e/tozije.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/6c6c707f3c096dcde6167314ffabb105/luvabopibesufekupa.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/gd0k292ab7hke64fahafqt6b2v/46612538278.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/2524000f45a652f8357491552f990133/tekafodolakapopibiramojem.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ff23e034---polupimurototozofifela.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8995d7392c376f5f3679d35937a6bba7/94524909364.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add21be4b7a---54898295592.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bfad04f0---woxapojoneseduvubagesoxo.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b2b0545c8---ligopexojapewatogotedat.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/gekorigozowatubuwag.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c8580c6a333---morefegubekaxedura.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/p2fo0bsf0p3bkj87b4p3vtrs0p/gekexutosujokuxizurogexin.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/dufab.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fe6b67110---95720230042.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/9713204889.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/31434203868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+moorings+pricesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10945 16872 bytes
SHA-256: 42bec1c23a4db98112608b2099289602f5779f2847b426780bd492f20d6b14bf
font_01_sfnt_off00013520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13520 10480 bytes
SHA-256: 5274b81d17ab91b58b4b0919f371f64e5dea32f2d650278529170b01b1f0cce3
font_02_sfnt_off00014cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1