Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc2d87639e61291…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 09:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3216ed64ad0d283354b7fb0a9a5eb51c SHA-1: 5e9696118ca1cfb7e8b694f49468d680c04244cb SHA-256: 3fc2d87639e61291edf2fbe89b0feb80741209053545458e151fa227cff2ff49
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external files, many hosted on domains associated with compromised CMS uploads or identified as disposable. ClamAV and an ML classifier flagged this file as malicious, specifically as a phishing trojan. The presence of a link farm suggests an attempt to lure users to malicious content or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ylgems.com/file_media/file_image/file/38450443761.pdf In PDF document text
    • http://abwingsde.com/uploads/files/35765458846.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/80433826982.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/wonimifexesagofuv.pdfIn PDF document text
    • https://pellevah.com/upload/files/10869611230.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/kexizuf.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d844d12ba---tifiwivetavizitudafub.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160862a968951c---wofekugitiluvoxiri.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/41481314509.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a32bdb1dae2---pamigozapofal.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/murev.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/12717365956.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/8604ef69e9c991d9c90901206f1fdbc9/zezalinajemiwaniriniboji.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/fibopa.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/fisikizuxibikazuninibew.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/jenonegefasupoxa.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077bf037f386---64275605708.pdfIn PDF document text
    • http://seamacros.com/upload/file/43886925201.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/10224148336.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1a4e7f83f---7817879414.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/14664228919.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/4311dfabc47094151ede3be6f3211cf2/dogol.pdfIn PDF document text
    • https://binhvi.com/upload/files/49018508187.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f7c8a43a9d3---ditaxonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=porsche+boxster+spyder+981+preisliste+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_off0000cc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC31 11236 bytes
SHA-256: 2972299f506e7227949a5607e28c9ebb6d783d2f92c8a2f9dae45a20fd7daca2
font_01_sfnt_off0000e689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 17416 bytes
SHA-256: 2ed6df427f42ef5d8f52bcf3e820952b7f681f59047848f2c01858465c464243
font_02_sfnt_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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