Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac01620c2d035e8c…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 12:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2e766968c9b1ba2ef74911d053ae765c SHA-1: 7b68979d12f16283b29d7f0ef16cc85cc92493df SHA-256: ac01620c2d035e8c55163f4670df082875e96bdb4243d374cd9e8df00a32205e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external URIs and links to compromised CMS uploads and disposable hosting, indicating a likely phishing or malware distribution scheme. The presence of embedded URLs suggests the document is intended to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=call+recording+application+for+android PDF link annotation
    • http://improntediteatro.it/userfiles/files/puzutarefazogabir.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/44282157154.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132a3446a664---lenesatamunor.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/b851374461aebdfc77105ebfeb300b2a/faratuwedakejojatuledas.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/jaraxupewe.pdfIn PDF document text
    • https://le27.fr/docs/file/8330569329.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/jafulovufun.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/fodowipum.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614164742d9c6---wegava.pdfIn PDF document text
    • https://sanagustin.cl/files/21554692958.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd1aa83210---fiseze.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/26001495039.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/wopaxobijopatikidoki.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/xagos.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/208771492958de201c3d54ae73b135bd/73307306287.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132e698d46aa---tofobuzulev.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132f6d5e5c6c---zowezozedasuzugofupuzaz.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/xitenozirajifad.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/jadulunago.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/43818715469.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/vulirumagumumurisabo.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/finudimefaduruniredubid.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/rusokebanadid.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/82716571756.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140682f4d0a5---godabodir.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_off0000e3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 10660 bytes
SHA-256: 5d3c1fecb436464effed1ca67cfe73645eda9336f17deaebd5f2a6dfc608c826
font_01_sfnt_off0000fc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001143b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143B 17512 bytes
SHA-256: 4c22d9595e3162e71924d360b131fd92abf6903e66f9b859b0fcf2973d3799c9

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