Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9eb0a29e62845e…

MALICIOUS

PDF

90.5 KB Created: 2021-10-19 21:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2835955588e06d4ffdf36f4363b49dd3 SHA-1: 42a4ed498f52020825ae1067a4c2d558c197864c SHA-256: be9eb0a29e62845e96daa358b82049ba950b11597581ccb488bcb9f08296a91c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://t-groupvnxkld.com/uploads/news_file/2771673712.pdf In PDF document text
    • https://mtestbd.com/assets/uploads/files/58128650438.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/1132485662.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/pamubakamubu.pdfIn PDF document text
    • http://centronegozi.com/public/73649991419.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616b3a21a65cd---67491139959.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/99eb95a7d4eb84761ecde6c3b2cadf87/bakuxelifonemujegelujip.pdfIn PDF document text
    • http://deauville.ru/files/file/tabusonebanid.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/kefakofapudol.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95510568695.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/dufibawuz.pdfIn PDF document text
    • https://aurastaffing.es/upload/file/witizadojiga.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/57655125769.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/narivoril.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/kexoja.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/vafijutikepud.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/16911422018.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/saborarigovuxebo.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/64399387924.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/88806713892.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161664ed16c8fa---wetuwivinosuxuv.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/85475444721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BGAemAmcdTc/uplcv?utm_term=lettre+81+liaisons+dangereuses+r%C3%A9sum%C3%A9PDF 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_off0000ef1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1F 11060 bytes
SHA-256: 6ea846ceacd23cb4d6995c441205a761f1e1a814a7ce0d031bd1098dcf3eb00b
font_01_sfnt_off00010862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10862 23568 bytes
SHA-256: 44bdcdde0d5568f02c315031804d8b84816128d5bcd740853758e246cf9c0f48
font_02_sfnt_off00014253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1