Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af910bcecd11a49…

MALICIOUS

PDF

85.9 KB Created: 2021-07-16 21:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a2c0bafc753bdeeb7100b583cbd10430 SHA-1: 834f7799612a8775acb02cea3fbdbc3df455736a SHA-256: 9af910bcecd11a4954d183c819cb038e5fc21d21b535ed4f6355fbf2b1a48f74
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a3f85b93f124a3fecdff64f330d6655a/zinagazasuporanuxun.pdf In PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/50203442810.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e39152a07---5143627261.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074f6e6e2733---99217197092.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d374503c79---60941985130.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160e6807b04a5b---78424231887.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/nobetexijarunuxogumax.pdfIn PDF document text
    • https://dietacud.eu/upload/file/nomuwevopafodiwemi.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/nutuzolu.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/82aeb650d049418759f951d65ba0dcd3/81222554249.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b063f34d981---wenumaxele.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/mamarola.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/30158598298.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/devaxibojirun.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/e653752ed171f9b4b297bbdd47a44696/45495052296.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/8225141386.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9f55061c4e803851c24253e821a1902a/99719291203.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/87ct5qld7dscuiadqbc5jfeag2/bomiji.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160770e6dc1ea0---bupulutolitakebepivu.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/dewanu.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bcc4880c7---46332988911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+great+expectations+quotesPDF 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_off0000eb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 10920 bytes
SHA-256: bfc5c450810a691924363f12bf56ec574cf1950385ff198a39fd72dd5b45a2cd
font_02_sfnt_off00011c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C44 17184 bytes
SHA-256: 4903dc7dc34bf7680266e7d3671107f86e0f92da6c58a5d101a0658e46c506f1

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