Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e71b91c015d6017…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 22:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 050c6e23c0cfbb7250147c8167259e6e SHA-1: 0fa11e72716cd870da0ef706e7c64afdcd8d0ab1 SHA-256: 8e71b91c015d60171050d5f5778a9c52ad3f88a8ead3263f918a698fe04c31e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, embedding numerous URLs that point to compromised CMS uploads and disposable hosting sites. The primary purpose appears to be directing users to malicious content or phishing pages through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://madmojo.com/fckupload/file/66332633430.pdf In PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071665897931---99924937639.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/83d7fa0589210700cf60bb34d1ea32cf/puvasewitixowogajowena.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/54479002057.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/dlm98oaee7hdrps5l73gfe01m1/tumibezejesurul.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/gawufodebapuwonu.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/433d31e5105f9302189b1558c5eb99eb/69760661981.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16072163a355ba---rupitudapomu.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/fc32787544c99a470a54d3d7246d5d1b/gipumipavureziziwuwafiw.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/mixafuraxunawo.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/degajenezefarolusijimavom.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210830122850.pdfIn PDF document text
    • http://fittbike.hu/files/file/13104987078.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/47286465737.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/d15dbfc83533d5523aac4999ca13de9e/15463406266.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/vufalajijadij.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b462bb2c59c---danezite.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/icabdmcbhno1pgcujrjf1nonoc/86032245974.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/livumapavitadotulejem.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/13760855464.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845a5858ff---besepafapolemijixeduj.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/10545080097.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/kh2equ2p2k9adfpjfo6fcvoerm/wuvelipetivopisedejuw.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/44ceea7567027cdc4ae6fe2297542cf2/90168764186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pautos+at+padamdam+worksheetPDF 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_off0000db1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1C 10696 bytes
SHA-256: 92d0e7c235cea17bc4cddaf9f62f7e87eeed3d64831d3fec3334db5939508fe5
font_01_sfnt_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 16892 bytes
SHA-256: ca12a43a0b88659962ab673759d1e555dd67c5929a67438a12b2dbfaf9f16fd2