Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc4e3b8a42da3ce…

MALICIOUS

PDF

70.5 KB Created: 2021-09-19 11:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8514aaf2e11a8f8753fa7162f3b43055 SHA-1: f002e0ed10077597d5ee8bb64c1a02023a2d9a29 SHA-256: 7fc4e3b8a42da3cebe3723473dde9590462d379afe5e377f6d9338617ef0a85a
156 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, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=can+u+see+a+private+instagram+account PDF link annotation
    • http://jsdarvin.com/files/85782177324.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/xedew.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613be6e38124b---49951881411.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/kavejexupesexin.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210915_153829_3721.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138ef64ca316---gevepulevovasavexiz.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/bajobozowofuwixowobuguxo.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/pezurinejopobelupiviluni.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/dewovelazezadisexu.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/divurikazuzasidezunigibeb.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/nisasisar.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210904_15ED8B5CD4CDD99F.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/70324824121.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/sekasut.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/38837087722.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/19b0bea43a84548319176b04788ef2ad/72552311231.pdfIn PDF document text
    • http://kgmda.com/upload/files/rufojo.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/7592786253.pdfIn PDF document text
    • https://mmszke.hu/files/file/rotiledokoxi.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/81803158461.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134aa65c09c4---rezalu.pdfIn PDF document text
    • https://betsin.org/userfiles/files/dotimobedanogoxibezofeb.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210906140158.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/8668038576.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/dovotumefebozuxe.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_off0000b3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DE 15500 bytes
SHA-256: ca1f97908c17b29d26e7abdd9f4bd7b167ba34efc7da653f11de6c3adbdcc953
font_01_sfnt_off0000db4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 10868 bytes
SHA-256: b9ca3ceb550f763a0e55e43e402f14690a2785d8367912e0e03c4f8363e1f7d7
font_02_sfnt_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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