Malicious PDF — malware analysis report

Static analysis result for SHA-256 423fac42c7569477…

MALICIOUS

PDF

96.6 KB Created: 2021-09-12 22:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 077366f601112ef41da9641064397a08 SHA-1: 70d20ac073c0701ca597e7384686546c976225e5 SHA-256: 423fac42c75694779527fc0da9affd8fe24904c45caca7bc1948b93834e31351
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://markone-tools.com/upload/files/69538105907.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138808b657d8---60992990384.pdf
    • http://canadianrockies.ca/files/file/gizovudagadisumavuxizovof.pdf
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/86974360214.pdf
    • http://bladensburg.abwingsmd.com/uploads/files/kozozewuximonipokumokufu.pdf
    • http://nhungbaithuocnam.com/img-tvdl/files/68226388145.pdf
    • http://www.louisianarebarcontractor.com/editorimg/file/21560267791.pdf
    • http://siblom.ru/files/upload/file/kivafakafitew.pdf
    • http://tubelessons.net/cms_images/file/20345446935.pdf
    • http://chrisdepanneservices.fr/Sites/cds/files/91789370333.pdf
    • http://abwcoliseum.com/uploads/files/neneve.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136a156a979e---vewojaliviminava.pdf
    • https://sonntag-immobilien.lu/userfiles/files/lusatuzoxogajobizolid.pdf
    • https://ichibaninfotech.com/ckfinder/userfiles/files/5554105792.pdf
    • http://bmcnx.com/userfiles/file/43119174453.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ib7fia1h8cjon2g3o1gt3qjppu/fajuzumaguvesare.pdf
    • http://oresteruggiero.com/userfiles/files/35091249281.pdf
    • http://gzcil.com/uploadfile/files/defetejutuberi.pdf
    • http://work4shop.cz/userfiles/file/2608169577.pdf
    • http://aostavet.it/userfiles/files/kizexonamatum.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367b2063683---finupuxegapanusi.pdf
    • https://mollis.rs/files/60245237495.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612efca0e04ca---18208228492.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=50+shades+of+grey+3+online+greek+subs
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85e.bin
a04e3b36fc3384ded8a986fbc6e17b30295b66a92dc4800ce79f8369b881d5d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE85E 16564 bytes
font_01_sfnt_off0000fef6.bin
fcab85649569779e88098325f5ab9e93220e0d5bca94ba048b91571bbf87ca41
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF6 27264 bytes
font_02_sfnt_off00014232.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14232 16792 bytes
font_03_sfnt_off00015a49.bin
2baf65394941ad0d8bf171dc862ba592887b41b2bced93422f0000154534beb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A49 11312 bytes