Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d809f3f41903bb…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 08:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 670363eaad20b72136c91ff108746677 SHA-1: 7a1e21c844d4c0c0d29dc6900d61c5ea119d8434 SHA-256: 03d809f3f41903bb962bfbc89d4a3144bd6979029b919ebe63ca1a4b0298996d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL targets are indicative of a common tactic for initial compromise.

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 http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/vudetu.pdf In PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/46cf1f6ab2ddad21f0a7ddf50ba24cf6/45824396181.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/38161570970.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/a6ed3ecd46f0997f80da87e12b6491e1/55016769853.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/satud.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612bc84b8f00e---sumexupuxuxu.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/hs3aceavigcrkutjtoio9ojno3/94089934795.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/labawepazubirukasubowozin.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/powowigurotekig.pdfIn PDF document text
    • http://agriturismofattorialucciano.com/ckfinder/userfiles/files/fepulogigu.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/laxejewepadanujado.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/dubiromamavusemit.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/18954446949.pdfIn PDF document text
    • http://cecev.com/stockages/files/57106443479.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a135831d0fa---65905147402.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/zusixomuxofipevuwemu.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/35480988829.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16f8052524---44078861302.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/54719863685.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/koxifibidi.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/10250cbc0a3e1da58f85c01841eb826c/18466570628.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/55s6k9m397koh6md0es286dt0v/ginijubu.pdfIn PDF document text
    • http://realestatemiami.com/userfiles/files/1714904045.pdfIn PDF document text
    • http://ippon.lv/uploads/File/gugumetaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=one+storey+house+complete+plan+pdfPDF 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_off0000d888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD888 17656 bytes
SHA-256: 1f35e8a6aba19eaf9c8b2784f4075d207ab6a6fc14b2d9cb2f2deac5966ab30d
font_01_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 11032 bytes
SHA-256: 53b0b009c23ce54ab0dacb985fcec329cca08a1f98ebabd9e585f6e6b16d0abd
font_02_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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