Malicious PDF — malware analysis report

Static analysis result for SHA-256 765faf6a409c9dd7…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 18:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30ade300a8fadcf774edd210f00a4ff0 SHA-1: c341917916ce83fe93ebfde482c9835c3329d63d SHA-256: 765faf6a409c9dd721d9987babed87fa815dd79af68077c47023cc79e811938b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or credential harvesting attempt, potentially leading to further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607df82f913ad---45551375671.pdf In PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/9ac598637264022c4589b172be76e711/zelizijoze.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/00ed41edc20117a3be0a631aa5a14fe6/79829313520.pdfIn PDF document text
    • https://yuktogel.com/contents//files/77923448256.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/45850462738.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/logefitezamupam.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/lakige.pdfIn PDF document text
    • http://geodez.com/pliki/file/tunifujisejepu.pdfIn PDF document text
    • http://k1a.ru/images/files/file/savejatutesebiwof.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/xenitopunakikovovo.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161277231e4d47---dogokebinelulixowejamix.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/goler.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/hm3gv4j8m8sr2uf6d1vri8eph6/vamiza.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/begatifakupo.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/30266528399.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c465428bf9d---xasani.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/suxoguweginuzepexokaj.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/noboba.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/2865739658.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/b5694a4ce36fafa8fc07081d5cb1b607/53214078770.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/89655669792.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/bogukif.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/64242780782.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/90800669179.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16228463061713186383.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e67433c9d48---jenikanepulot.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1418e9b388---wupijefivokukuxideb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=marketing+director+job+description+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/7425a54a7263b07389237db7c5f80f5a/60001462801.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_off0000e508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 16980 bytes
SHA-256: dd0d93600838d3f606b47c12657c6f0a6c46ff56ae6b088a9d75e35393bc3686
font_01_sfnt_off000110d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D7 11104 bytes
SHA-256: 3ef1f7a96fd296aa0d88c4e720bfc3adf8bbf9e4d4399db2fd50d3bd2d940a3d
font_02_sfnt_off00012a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1