Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3cdd7dcbc40863…

MALICIOUS

PDF

73.7 KB Created: 2021-09-22 15:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b09a3e1b83c237c4c52e5279aca980da SHA-1: a4dabbd8656758e72345d6811b90bc7d07ea5dc3 SHA-256: ae3cdd7dcbc40863fac5aa9865631191ac1feed810dda6640ffe4f51d6b29fd3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=english+for+everyone+english+phrasal+verbs+pdf PDF link annotation
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/zasikir.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/12125685099.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/39721941884.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/depalixad.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/wulimulironataw.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/kulesipi.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/7b39ddc9e01b8eb8893afcdb0c4a9db6/zuwikonevumod.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/79o5gcvhemmunpq8t4fnt2ll10/naxiwotedupirumivopek.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/xobamiritipa.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/73354839805.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2e4c40df14f28ebe083a5024bc6a500b/18069469383.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2524b8725---93518084414.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/bp2pbqcgmllt2ojb2c20p984rn/67474696908.pdfIn PDF document text
    • https://mlspoland.co/files/file/tugunifidaxuvuk.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/27552727048.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/28204020459.pdfIn PDF document text
    • http://www.siposferenc.hu/html/71042384315.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/rugelijow.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/27545736546.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/xejefeviwok.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/nijaxitaroj.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/8664957274.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/1485aa951cc4111917ca9c33f6d6f976/gekexiwisuj.pdfIn PDF document text
    • 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_off0000be5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5F 10980 bytes
SHA-256: e54008527336e468757f0f523d1e257e587495df8f63c0bba847d47c53c9d7a1
font_01_sfnt_off0000d756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 16176 bytes
SHA-256: 002b2b6ea5f5be62d6c88b09e5a978a5a680eac7e11fc5a9eaceb09cd480d1b9

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