Malicious PDF — malware analysis report

Static analysis result for SHA-256 21975323f71ae3ff…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 15:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c43cfc100af897942bcf8d320b70b89 SHA-1: 0ecdd799f6cdf022b95600dab03e73222ec8e6f9 SHA-256: 21975323f71ae3ff26c5522666fd1c37c3f0e44534b03a4733d72c74ee330641
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload via the linked sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=live+nettv+apk+for+smart+tv
    • https://carrieres-pierre.com/userfiles/file/61609382446.pdf
    • http://compow.net/ckfinder/userfiles/files/67531096725.pdf
    • http://wxbeimei.cn/upload/ckimg/files/202109141518199100.pdf
    • https://thefertilizergranulators.com/d/files/71975145134.pdf
    • https://braveathlete.net/geektic/files/72175905361.pdf
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/7976849814.pdf
    • http://purepassion.pl/userfiles/file/73811592234.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d0903f9437152306b650a5a235fdeaf4/bunolufevelamakapor.pdf
    • http://school15-tyumen.ru/f/46305753629.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613631853ecbb---65009780283.pdf
    • https://betenenergy.com/sites/default/files/file/50585891014.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/6a07cae193a5061f9047a61e9867a592/88138475478.pdf
    • http://dancephoto.ru/userfiles/files/jonelufarekokatasuzago.pdf
    • http://eg-connect.com/uploads/editorfiles/file///44952403766.pdf
    • http://happyland-nsk.net/ckfinder/userfiles/files/34273656558.pdf
    • https://aydin-elektrik.com/resimler/files/74992576292.pdf
    • http://nanouklid.cz/upload/file/jupigomoxoxage.pdf
    • http://www.museopizarra.com/ckfinder/userfiles/files/65557732560.pdf
    • http://smirna.pl/files/file/lajexexudigaxelibu.pdf
    • http://fotosvatba.net/userfiles/file/30999682930.pdf
    • http://classicalgardenfountains.com/uplds/file/rowosesimuxifu.pdf
    • http://qataminational.com/uploaded_files/userfiles/files/keduluzexi.pdf
    • http://jl-vacuum.com/upload/files/mufejanugapar.pdf
    • http://ventima.ru/userfiles/file/ruduwosidifowopa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e2.bin
9d07849a15d0b31847929c685fb25e56f44a632e3838977207e1bf4f627f19b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 16908 bytes
font_01_sfnt_off000104a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A8 16792 bytes
font_02_sfnt_off00011cbf.bin
38c5810496e0ccec9d88cb75419c23dfb4c007f40e489493d2d5295fc588ec2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBF 10588 bytes