Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8953dd8dd40e2a…

MALICIOUS

PDF

85.4 KB Created: 2021-08-23 19:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 859c632906c039bbbd185a0176e46108 SHA-1: 53df24055612acddad8257cedd80f26a83ebfb7a SHA-256: fa8953dd8dd40e2a3891028a643202b26b917ff432d03f86bc72c421f62cd0cb
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://benqmusicworkshop.com/fupload/file/17315794834.pdf In PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082160dc0161---xogaruxerirekawabemo.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/kujufawapumal.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/zodegeponixibu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ad1069216fa7a08849d08ce2ece9c0a7/timelimojotanojejakagiz.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846216a3384---992922890.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2174ee3bc6---57335276374.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/bedom.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1603f790---67105162278.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/sabun.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/6m4r9sdsb3a9iuh91lcgfbdhrfcllnrk/87382144454.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/52018674479.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/jawaxawuxo.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/11591977479.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/bozokenasapiwubanate.pdfIn PDF document text
    • http://laduses.nl/image/file/xuwulolusaterike.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/6a9b7dd98a1eb14c788bef79af4e55b5/sinope.pdfIn PDF document text
    • http://teknis.it/userfiles/files/46450533454.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/98058091965.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/68993651997.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160753ff5528fb---74126877868.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/51238490431.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/9f73f48622eaea0f9253294b1494676e/88908790515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=advanced+statistics+questions+and+answersPDF 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_off0000e969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE969 17744 bytes
SHA-256: 391e3602ce180c6daca129d64e00b9a49ce7ab967fe84ac3ae4cbb8dea2575ec
font_01_sfnt_off0001173d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173D 10696 bytes
SHA-256: 7c35594a4306a0a2d43b4e97cd0d7803379ee689bbe261963a8143de073d0ca2
font_02_sfnt_off00012fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1