Malicious PDF — malware analysis report

Static analysis result for SHA-256 551e2ab3f29ee07f…

MALICIOUS

PDF

77.7 KB Created: 2021-09-08 03:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b70be242bec702233dad7b2a20369ca9 SHA-1: de3e681a308a907a68e18c9369ca27d87cc3c601 SHA-256: 551e2ab3f29ee07fd1a8a2add99562b3d9211a044f6adedbb5651687529b73db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on disposable domains or compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.
  • 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://synerhu.ru/uplcv?utm_term=acute+pancreatitis+treatment+pdf PDF link annotation
    • http://vhshf.de/File/46900890987.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/45700290856.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/lelosusitizafom.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/54386038755.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/72023807339.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/78147641700.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/29184806652.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/b0af5bbf8318f04a321a664b9266198a/55694661945.pdfIn PDF document text
    • https://quizai.com/uploads/files/jojiduzisom.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/s937873hqs15pude7nbp9kgav5/nidozobovejaxekitozofes.pdfIn PDF document text
    • http://stringladies.cz/userfiles/tatevup.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/refibusowupiwevapus.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/punagefajopolejuvera.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095315c35dd8---73026465935.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/savusipiz.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/dajezukujeto.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/netunapumifujax.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/gogixavutifutusogagunut.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/vijisoxadamifozijomavi.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/6mdennk9mjf9o7kno2ls7fhhdq/ragikewekiwixefavaredax.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/79864278680.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d7bb3fa487e40f4eab02eb6397afd186/91192695804.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/33885887387.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a634159f107---lomuvulepo.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea50361dc9---13165797813.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_off0000cb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 17572 bytes
SHA-256: 89bcbdcd53999771742c4eff87c84120adafc0231aca720948c41e5046403dd0
font_02_sfnt_off00011098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11098 10696 bytes
SHA-256: 94000964a8c3a6f9fe414f0a4083fb44bc63cc391979bccbbf87084e42cebbb0

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