Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdcb22612b7ddd86…

MALICIOUS

PDF

89.9 KB Created: 2021-07-06 16:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1b2626b93143888ac0f65e4b37a887ec SHA-1: e8f44be552d55fdd863d93fa958982496c8c6316 SHA-256: fdcb22612b7ddd867207fed1f3f02c465fdcdbdf703d2b73f831db61bd15b1d6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves tricking users into clicking these links, likely leading to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=money+in+other+words PDF link annotation
    • http://10glazsikeyrosa.ru/file/99865058518.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/n1rkiggvfioqf8p56hgknqd2ce/5037503421.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/89495291945.pdfIn PDF document text
    • http://hasyo.net/files/file/19268552293.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607777215c93d---58962420692.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/54819132199.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adbca0bb61e---17140162619.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/23693994191.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160940a52795bb---kujipexubalaxi.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73cd086bcb---wekuxenagawovijolo.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/40e7f4f8b10814ced00b9fef1b8648ff/32638801659.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/3cd7601dbbdee4c7844129e8039aea3f/63018236718.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/jasixepigaperowodobuxe.pdfIn PDF document text
    • http://accronline.com/userfiles/file/38043272310.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/rukifed.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/vgs2dn8dr7ktm56uh2egmhjger/61181908597.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/bekafukuwudunobitas.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089618f4a4e7---11596905510.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e5ac0f30ab88ffa6f579ea622c200edd/subut.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/ganorotanevuxegona.pdfIn PDF document text
    • http://medica-brno.com/files/7958565451.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83731649c---88432802998.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/db05ca54a7ec0c454ca977ec30579e7a/7032350844.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/98852788949.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_off0000fe4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4D 10332 bytes
SHA-256: e0c50257c2be310430f0e2651178eaec3495e9ff181adef3fbd5c5b45475bd8e
font_01_sfnt_off000115a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A0 17192 bytes
SHA-256: 911e1b5799c2027de639088ef2b68b0e774e2d50855907a9d319cf762b69ea6b
font_02_sfnt_off0001427e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1427E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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