Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f6bb6fc9b4d197…

MALICIOUS

PDF

73.1 KB Created: 2021-09-19 07:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c51fb46904ccadca39e80cce80bb3d97 SHA-1: a474be2334f09797788fd631aef9c8e2ac0d87ac SHA-256: a7f6bb6fc9b4d19774cdc841e46e01891eb2e47074b4897becee11cb7fb94105
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=circular+progress+bar+android+studio PDF link annotation
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/darowosakevil.pdfIn PDF document text
    • http://langyupharm.com/upload/files/88197765290.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5a097e3cc---febisowozegamunogaz.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-6/20210906095250290219.pdfIn PDF document text
    • https://somogyplusz.hu/files/54313620413.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/59374052972.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461fd86f57d---jutikefowodatup.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349f1f04489---47084412024.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/mewuxupater.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/sasitolexigazuzuwo.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/19542302885.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/52679236287.pdfIn PDF document text
    • http://it-hair.com/userfiles/levifapapurotuwexoto.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/9274709383.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161328ff34b7a4---96974820892.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/96567810891.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/51341398280.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/folef.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/tapuvajagugufori.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/zobadojapiruti.pdfIn PDF document text
    • https://pisausakti.com/contents/files/nuzolumodijedo.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/vesam.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/sobol.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335f1629134---69453061483.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_off0000bc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD428 15848 bytes
SHA-256: 5cbf31c755f00302ff43ef0a755799731b4625fa6beec3d50374c067a59c4646
font_02_sfnt_off0000fd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 10960 bytes
SHA-256: c51c1542a9ef98fc9abe4bbdc9290fa6c7bb69e6bc0a081837308a8041756830

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