Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0ce99d6ea9d5b7…

MALICIOUS

PDF

79.5 KB Created: 2021-10-10 07:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 38c1db9b5231e6accdb1d9649beaa6e9 SHA-1: af6c8689686e23079d0dafb93ff911066c98a0ac SHA-256: db0ce99d6ea9d5b7b1ab49c237903637c09f5a107b315f48e5a47e6afe299080
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

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://crewmak.ru/uplcv?utm_term=my+two+favorites PDF link annotation
    • http://1carl.com/userfiles/file/63791412948.pdfIn PDF document text
    • http://apex-architect.ru/images/file/62759122545.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/77192739505.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/nojinelukuwanozez.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/lemogivol.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/gadexizeleluwewivik.pdfIn PDF document text
    • https://serka.com/serka/upload/files/42069684056.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/83839983980.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/kowileworime.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/pajaweme.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/gebamekuxenuv.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/tatotubifurabikigos.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/73371168167.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/gidowifaselatulotug.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/93529049548.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16158e417ecb42---fejojabugeta.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/jusuwudutaturifuzag.pdfIn PDF document text
    • https://tenderdiary.com/ckfinder/userfiles/files/bugajelob.pdfIn PDF document text
    • http://blccy.com/userfiles/files/zibis.pdfIn PDF document text
    • http://protraderin.com/userfiles/file/76319986773.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/45da9b2bc488c7f464462b9ff1d2bc83/motelebonejekefedopujaxin.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/98230733403.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/lalewezibinonekufevut.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/70q53app30jdqh2vopgkogmgav/65819897758.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_off0000d5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E6 16748 bytes
SHA-256: 57ed7eab3775b12af4f502701d1f681d152e544e77d842f448363a353c1f9514
font_01_sfnt_off00010133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 10316 bytes
SHA-256: 098c7272d3bd1ebd70bf506ec55c20f8059508c1140a97daa5479e3aa4fb60e2
font_02_sfnt_off000118b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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