Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5a2d34558edc6e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 17:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69026de81bd7f4f2c67203e1f3d11713 SHA-1: aede2479634a2d3f44f1453d5468406572faeac0 SHA-256: 1f5a2d34558edc6e494cc752c2b387b4bc3ad9a043907211194c397e53c63da3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm or redirection scheme. The PDF structure and embedded content are consistent with techniques used to manipulate search engine results or distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://doggystylzgrooming.com/admin/photos/file/51685103355.pdf In PDF document text
    • http://ferrocom-spb.ru/userfiles/files/79787391456.pdfIn PDF document text
    • http://geraldinekilkelly.ie/tekivulewopeto.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/koniduxozadidugezuvikapad.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/divavodifepoj.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/6ku1m2sd5jdl5i4plqepknm7lc/99365381730.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec77e3d674---vibot.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/8vajf0bsn3oc9ip4n1q9585163/15461689763.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/701f85375b610637def942918188f712/28851247057.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16073a106d7312---fenetawizagul.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db399f88cca---17029312718.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210526100920.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/kiguwawavoguvuwokar.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/rowaxokume.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/4d9a58eced5845a3827fbada203da4d9/91412055636.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d388fa44b94---mugusotoxipob.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/wevazosaza.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/nolomezaxomaka.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/pufojuvidirutojek.pdfIn PDF document text
    • https://giovannicaputoboutique.com/file/xazipozafejiwakaxez.pdfIn PDF document text
    • https://petek.biz/resimler/files/wunetelis.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098591a3521b---86248176169.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/87619321727.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/topojuzadozejoxa.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/46bda75kn8ndpe9hjupo1mgbp5/65426127716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+human+body+book+pdf+freePDF 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_off0000db10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB10 18888 bytes
SHA-256: 7e7248f1f14642b4b5e6d144c533113a82891d96a041b5c3b9bb6a8b23a10edb
font_01_sfnt_off00010ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 10768 bytes
SHA-256: ed196573f47e51d64c8727824065489430f8d910c742f97e4b9f076fa6cb1fa4
font_02_sfnt_off000123fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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