Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1ba439de182f4f…

MALICIOUS

PDF

119.8 KB Created: 2021-09-01 20:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 43c185e7bacdaeb390bbdbe70f29f4cb SHA-1: 38a117af8aea4eb200f495c5fe81f27eef72f178 SHA-256: 2f1ba439de182f4f1fe8aa88438aa207971caa332b4b71c3e1752cd10b126f75
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection further confirm its malicious nature, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the overall structure and URL patterns point towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://synerhu.ru/uplcv?utm_term=nims+100a+answers PDF link annotation
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/ca7512e57908642b1daf42e86a4774b7/tikudumeximir.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c4da3d4cf3a7a6d01f47c2b84113d2d4/pomenolobemokor.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/b3125825ba99919aadd4949bdf6b629d/63803877235.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/dulerutoluwuduxaj.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/bilazademejugimu.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/dimadidutibokugif.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/53953474783.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/e6a628f6d84d41be309075a81e4bf9cf/fekibebi.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/55697079064.pdfIn PDF document text
    • http://belloverde.net/emailer/file/32158644688.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607874304a621---zukeno.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/29933175054.pdfIn PDF document text
    • https://chemasan.lu/userfiles/files/73676260227.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/40351629104.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c73f55668c88573001fa6d3dbaf2381f/7105219093.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/90875766876.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/mpd82v9bbd59kagroc78l24r6d/neregevuwusisetaz.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/66110876304.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5deeaba78c---67643151561.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/10723806211.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/f58b211dafbf4ddbf98589474fed39b6/dafokaz.pdfIn PDF document text
    • http://chinahongji.com/d/files/kafotove.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/48095287982.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/53362606541.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_off00016b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001831c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1831C 20544 bytes
SHA-256: 71864a0ef57700d575f25048cd3fc7e89413a7959f052216e11005f5f5d12f67
font_02_sfnt_off0001b8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8C8 10240 bytes
SHA-256: 539003b7afa0234a7cbff69c5a51794faa90e30aa13d29d4e5871b83cfd764b4

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