Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab91a6ea9b6e0d22…

MALICIOUS

PDF

86.4 KB Created: 2021-07-23 02:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: cf12ba2501e679c89c08e25a540896bb SHA-1: ada27abcfc46d23a8672450b476bec30b436dd4c SHA-256: ab91a6ea9b6e0d22ff1a9e2848bcce8903c76302ada24b48952efbefb97c3a7c
164 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 invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://alajuusa.ee/media/contents/file/28685931416.pdf In PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc4a3f1ceb---19897674052.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/49114146e60340f3a79f51a18a112da8/lakameresizikaxesipibumi.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/kuzamev.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/sirituwe.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089e3167cc5f---kabepenisujobonoziguwine.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/96007879895.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/4420131326.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d2ee87589d6ea039e38dc68ab55a679b/4768306217.pdfIn PDF document text
    • http://thehonourride.com/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/jofiwa.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/mupafojokaxetebalawoz.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/senobivepizuvi.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/nalizixuw.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e13aa74e8---48784791945.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16098410a52e9a---jedozanumajifamobib.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cc4e280278f62cf7cf3d6b3ce3da6364/dapegilefun.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607640e4be044---63483211948.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c05af79734---mupave.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/62901809781.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7252bd38c---55731719657.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/xegipusanitifuguv.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/11410424846.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850d3b7c91b---sedofuwadanatevowidikibu.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/jagoxar.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072eb62a6812---2959149658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=level+1+dfd+for+banking+systemPDF 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_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 17200 bytes
SHA-256: 78c6d33c57e5bfa632b89bf6858dff1eb548bfacc3be709f0ffa8c7c7f34125b
font_01_sfnt_off000118c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C7 11116 bytes
SHA-256: 99fb809eb67462dd4c7d4c9f4cbff3b2454821799b8e209dc1f6f4cb8363e604
font_02_sfnt_off00013297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1