Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0cbfb4b68a8e89…

MALICIOUS

PDF

71.5 KB Created: 2021-09-08 05:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d3562bbc9d17f505bb76398911ea350d SHA-1: 7f5ba6f97760e26aa46e0c7996249f715713f2c1 SHA-256: 8a0cbfb4b68a8e89270b93bd58ad9c66e1ed98e4721c57106ac5d4ab0059f272
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, directing users to download further malicious PDFs from compromised websites, likely as part of a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and URL patterns indicate a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://logtech.cz/foto/Image/file/luxemerujinulil.pdf In PDF document text
    • http://hoshitorionline.com/uploads/files/vifebumanodemavekusaw.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124f41691a9a---47399156402.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/20062707215.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/82d84jfi9nub4nt1cn6i82cf13/fapironotunipolotomekusot.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/9schvnfp21r88535ahb423va1o/faxijedorapuvik.pdfIn PDF document text
    • http://strandedtattoo.info/file/88047946292.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609102dae9cc7---26232871937.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/48285703046.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/5292055760.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/wositadubeji.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/19421772887.pdfIn PDF document text
    • http://lebo1977.com/clients/7/7f/7f96701a3ad848a090446b6ea7dc17b1/File/95791593948.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8bf0895a2e57ee9e73060b4748082caa/koxagu.pdfIn PDF document text
    • http://riversedgefm.com/files/file/11491091927.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/a04111db87130a2a70385d65bafcf3b4/zowafibovuvufijavawa.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/38ab987bfd4e31585c90c8ccedd53274/tililonokidafiro.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607143cd52a54---ziluna.pdfIn PDF document text
    • http://bptramptour.pl/files/file/15409902103.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/mesabifepowafuvef.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/wubejipurugetawupasora.pdfIn PDF document text
    • http://charnafamily.com/clients/60216/File/wedutil.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/50496540588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pdf+reader+download+for+windows+8.1+64+bitPDF 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_off0000b4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB5 16080 bytes
SHA-256: 32fc78f246c751f236dad7c43371fcfc8733f1e6823009e4a13bdee1d76322e8
font_02_sfnt_off0000f5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 11144 bytes
SHA-256: 087eb772e468da19a6c3ecdb69caad69abeada7373c7a384000b6c0ec3ec4d02

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