Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc93993ee1fc823…

MALICIOUS

PDF

102.1 KB Created: 2021-06-27 22:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 76af634d1069e1cddaad04eb3287af70 SHA-1: 5928f059d24b499bdd2ad91030937674effb2752 SHA-256: 7dc93993ee1fc823cf6fd086c16067cd58746b2515ed6e392e0ecf11e5f28a34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812becc6f36---sugemesaxomixo.pdf In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a77e1d6022---zevowegotovizif.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df314e94d3---jugajowuxitifopujonol.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9c8527d5---90461543040.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6c994fefd---84560126266.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/xotesijomabu.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/85902154714.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/dusuzameluwa.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/87592654448.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/nizekesuwiribej.pdfIn PDF document text
    • https://vijyaiprismcrm.com/userfiles/files/1733942139.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/007628d26a84ee312ce0e87e06117597/daginorapabew.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/geolst8a7tvnmu1usoph05ktu1/bomixoxitibizoxagigiwo.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/2fa3558b12c41fb0b7e5b186c8cc5a23/kaxinoluwezeluwotuzonaxu.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/3f21b51aa61cce3092d89c077caa4130/mulejuxubewomos.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/77893797789.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/bemuradirinokigurux.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/padaganamilolinulawunovux.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/54703783411.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5547d426de---41474698585.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/jemitudiloso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=greater+accessory+bag+hypixel+skyblockPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11504 18016 bytes
SHA-256: 29814efd989a4b055a8a4a4d839f0988118ec4e29fd1268bcca21975eb2a3b7c
font_01_sfnt_off00014479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14479 5460 bytes
SHA-256: 6364eaa2097bad37788f01b2c6e984d01d972e8dfacbef7b5c28468d1285ab6e
font_02_sfnt_off000158d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D0 11036 bytes
SHA-256: e2343aa1406133b505a12af9373ad41d69fd81cdd5c4c73a8f408f1d29c5117c
font_03_sfnt_off00017287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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