Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1d77e2e7822589…

MALICIOUS

PDF

88.0 KB Created: 2021-06-30 21:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 563c9999339e970dc6b07d0d111ee9c9 SHA-1: 873ae2015c19dabf5b064a8ca7ece1ccc65f255e SHA-256: ab1d77e2e7822589a2afc294fd0b3f49d546745e72f691f3ecc145642c903558
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/oe10diljmmqrlugihco809js6i/97924592861.pdf In PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca11b7a039---nazolasenelosewuwopupum.pdfIn PDF document text
    • http://aimic.com/userfiles/file/vewivigipofopisobezarimok.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/90825966.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/500uqcust6fjdqnlalu0h8p85i/44410387951.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16075f214b403d---filovakatob.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080be0f448b6---tefazixi.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/313ce069d3ba9a803205d51921890928/30970874009.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/mivomituwemelusaxugonovul.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/18090597920.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/gerefiwuzexanidepadid.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/05c97e8be41231c3336514cb3b9af966/tifugenakirabiku.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b990744d3c8---farozuduxagositixerabujev.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/vilujalekibipewigatulejo.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/168e8dd8bb41cb1bdc630756fbbe598a/bipovufuxinifobuzexibusa.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/18166950959.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/pivajuwagaxugojefelobugod.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/011751225265.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/6ac1397fa065219866ed30b1a49cc0db/satajabipenesowezinevap.pdfIn PDF document text
    • http://hydrem.ru/images/file/19031107348.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/58336713918.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c739ffdcb9f---gixanametabizuzevesukef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+often+should+you+clean+your+mouthguardPDF link annotation
    • 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_off0000f33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B51 17732 bytes
SHA-256: ddc9518e281516cb64730f37c59f9919d33ac95e751d3c2fe39b139a409eaa4c
font_02_sfnt_off0001390f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390F 11124 bytes
SHA-256: 331f8211c08d993b6e035e84733f35a66cbf10bdd54cc71376c4eecc2e799b2e

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