Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbabc0fc7b900806…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 23:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f8fb6e529cf7601e0d171a2c7ed97ccb SHA-1: ebe27f6870dc92e1e9f09f1f3cdf95b1bf92bbe7 SHA-256: cbabc0fc7b90080669a4514525de45d4295ce9844eaf16a08b9fb2ec4c7330af
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to websites hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution through these links. The document body is unreadable binary data, but the heuristic firings clearly show the link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/2a3btk5rpvekv18bv7jhishn1o/jitaxitavusepubipifopol.pdf In PDF document text
    • https://davaocarrental.com/images/file/sevevagajufuwuxelonokux.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/037144415bc4cca81e0f1b6f52a98143/96139401922.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe01107dbc---fijazorelibegeboxovum.pdfIn PDF document text
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/bajijefivumexexezob.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/32970751428.pdfIn PDF document text
    • http://azizolace.cz/images/file/47229418891.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160841ec5c67a5---93446300208.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/51799593956.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/makobiwo.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20218282248461912.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/88211919040.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/tedivivetafurowowu.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/xizaxivemuloso.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a67ed02c2fa---pujigaxu.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/xelotugalizozefez.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ee28nkhc9e93h4s5d3dvj0id90/vobemomanolezesunikub.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/48123695053.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/16295544020.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/79572582547.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/sesugituloxifakubamu.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/42929562431.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/a42ff44809a1cd4c1e7cb2cb4adc4939/jifumulodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=python+coding+practice+pdfPDF 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_off0000dcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD0 10800 bytes
SHA-256: 6fa77b032dfc0f064dab0b0607df59d159135e56748638c83650914aa42687bf
font_01_sfnt_off0000f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 18444 bytes
SHA-256: 885306156d76ce993f1dd0162e94276794cbc1850eec724086e511f834d1e200
font_02_sfnt_off00012606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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