Malicious PDF — malware analysis report

Static analysis result for SHA-256 38773320818f3e3d…

MALICIOUS

PDF

91.7 KB Created: 2021-06-26 21:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 777887834130e9b34e52a2a4ef0df36a SHA-1: 388025262cbc84f2ab5e5c6187058745c6a97589 SHA-256: 38773320818f3e3d6c3f85d72ab97807bdb922b27ece69f6c7065a6bcb41c731
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the link farm heuristics indicate an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b11b8fe4f---redikefugemagemanin.pdf In PDF document text
    • http://duhochmis.com/files/uploaded/files/56870590833.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/oc00lj2j8nq815o54i6unnu47h/kokalivitizega.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607259052a3aa---tevibezudigowurunugiwela.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4d959a06e544aa759af8e14cf4f3a992/rujapo.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/xozuzasinigukib.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/vbrb8k648ikkvfu548n5vc6qpu/57949836377.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/27950994003.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/11072916450.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/cr9eds6ief3ou2dso68l7guvdl/65544760126.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/70fe81e4c1e49d92a26992894f34027d/94208549357.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df9773f935---5009832688.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7fddbfdd3---mibopopagavuruduni.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/48a409a72c2d224c2aa252944ac595b1/tiledotulazedidesotikub.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/ee12f55a7fea7080e8663f400121f93c/71600939167.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/10861139245.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb835d7b3---86489744085.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c41a4da05---52117960927.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db07003037---88964904016.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/6a20ece6885c969c530e4e84206e787e/59332136965.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/58780872783.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46fda53809---41433404270.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/7e75de635735ddde7a9860a93f150727/83467993576.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d0dadf537---5063213545.pdfIn PDF document text
    • http://aplus.to/userfiles/file/94627384662.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d4f9427b4---90921285763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=yellow+green+combination+colorPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9111e629ca---gesoleradumer.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_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFC 16896 bytes
SHA-256: 22eda2ea9a713f30ea9ef2388ef737af0db53ab8d69bbd47885ff6de22eebb51
font_02_sfnt_off000148f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F9 10616 bytes
SHA-256: f4292452f40e963cec40c46d5038246396ae09a177664a1e5e47155105351280

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