Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01b7cdd326cbdc0…

MALICIOUS

PDF

79.8 KB Created: 2021-06-27 18:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8950337840a04e319a9be8463aa149ee SHA-1: 5ef33aeb571d340e4ffad767682b54d74315899d SHA-256: a01b7cdd326cbdc0181482e00d303e058697021381d5307574ceee27844e8a67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggests a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://archism.ru/uplcv?utm_term=the+fence+man PDF link annotation
    • http://nedirajtebosnu.net/userfiles/file/zisefuxinijo.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/a2skppd3nh0b5r34af01n7g8uv/2742034212.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/99593161677.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/kagejagixibagolenorupijus.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608081c0c8c2d---kilidopopibux.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/8c80a855a63e84c9625ef9efbcd81dd7/56982005767.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3bf1fb919bec94325fc280991c78d583/91861108457.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/18917717477.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/55547922265.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088e3748bb23---63246202984.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/a4o419u9em38bm7v3v6uftirgu/49986098523.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/nodanulabanine.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/96cc870cfa78905b7b9a67eb48207c18/fewufos.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609128d6aa255---warusok.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/sagigexobobofolugerom.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/bokeb.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2ee673b4a---90180057122.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c14cfa1f8b0---28959271210.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/c792fa397b7e48c1267dcb2490909b15/zisonagawasafodiw.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/27040311394.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_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 17232 bytes
SHA-256: 04403ec14577784c761f6aee126cc5ae31eb12c6ed390e09e56fff0f99a76f46
font_01_sfnt_off00010388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 9940 bytes
SHA-256: 95a34e401fb0db7cd5550d386807c5fb76c4708b2bdb4cdebb1634c7c42a46f1
font_02_sfnt_off00011943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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