Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f55f398c7aa042f…

MALICIOUS

PDF

70.1 KB Created: 2021-10-02 11:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c5d10777b82d399f78f86223a6225214 SHA-1: efa8b5816521045d0311204f23782cd8533225d1 SHA-256: 2f55f398c7aa042f7b845a31f1bafc430077786d99c7d136c485972d77dd5d05
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the overall structure indicate a phishing or callback lure, aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://pixomot.ru/uplcv?utm_term=free+wrestling+streaming+sites PDF link annotation
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/4b3c1c4aa7461ad588db806c33a16564/21542324762.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161556d38cd2e9---jomurexakenovaripefepoxe.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/3935783130.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/gisebetona.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/52533060423.pdfIn PDF document text
    • http://reylab.com/userfiles/file/vigakir.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/65878931691.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/pebuminumafadalagizeti.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/54717643500.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/52572754171.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/ef7418c7d7b8d7829a944f56d1cd1d48/31195503255.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/vuwijudi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145011ca3d84---bawiwir.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/42905192076.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/nozilabasikazadux.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210917_71604A0AAD7DDCF1.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/83064834855.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/4lhlsh25ophfqu2mioc1516pr4/41848782586.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/15498596299.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/a046607dcb7bc1277462db9c7e8568bf/78483424036.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16155e9ae2519b---xezeje.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/44558995346.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/13816633055.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/wivizekenulixilasume.pdfIn PDF document text
    • https://limsurdua.com/contents/files/lasujususidulizow.pdfIn PDF document text
    • http://gro-felix.si/uploads/mopefuwifozijanulalowag.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_off0000b418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB418 14780 bytes
SHA-256: 36b14c9ce215822d352e8d44269bce430c872b25ca28115a92518f6df8c4dbec
font_01_sfnt_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 10396 bytes
SHA-256: a4b6da8b144f7d6830b363efa11e83469ab2bd0c17d9b62e2ad0da7654b55757

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