Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd67646842812ea5…

MALICIOUS

PDF

75.5 KB Created: 2021-09-19 18:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 992cda4658fb4402bc1d47713ddedd83 SHA-1: 652d98d8b3854d48e546ce46fc8f9c74d5727ff9 SHA-256: bd67646842812ea5eca9e0138a4e7f1455bb7012a933d56bb3ae11290df86d88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with multiple URLs pointing to compromised WordPress upload directories, suggesting an attempt to host or redirect to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the detection names point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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 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://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e54b2a67f5---6694650449.pdf In PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7aac1b910bd2eb83f0becdb093a426d9/kumisajulopegasixike.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/milozetumorujoza.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/nolesuserudeg.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/kovazibaxexiviwafoji.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614403e93c771---sikasoket.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dasekavatipozejonel.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/zukemaxowato.pdfIn PDF document text
    • https://rais.bg/uploads/file/gasadokizedakidupo.pdfIn PDF document text
    • https://masukpt1.com/contents/files/53899383335.pdfIn PDF document text
    • https://temahr.hr/files/73102992434.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/95995982360.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/towopularegaviloza.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/59876329606.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/riderurumisizuwivixujesor.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/wozotutisinevasugi.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/50192026495.pdfIn PDF document text
    • http://platcometals.com/images/file/2661771261.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109130506497066.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/37588982353.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/xeruwivelerivesaxi.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/40028108386.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613130f47e7f5---gulen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=kizi+games+to+playPDF 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_off0000c639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE50 10556 bytes
SHA-256: c425bad7cb928958f810c5dc457b46e35c896f394a81941a177bbf4bc7728124
font_02_sfnt_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 16560 bytes
SHA-256: 2107098b8b33d10df898cf8ed4da1f09dd065a9e6e316c0e96aebd4194a89083