Malicious PDF — malware analysis report

Static analysis result for SHA-256 2641f54355ea2505…

MALICIOUS

PDF

89.2 KB Created: 2021-07-10 08:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d6202d32753ef9915c3e8391663a2e0 SHA-1: a33306a68c7bbc6c91bc8657b2716444174f26f3 SHA-256: 2641f54355ea2505445f414789fcf6474377d1298f1394dab6d46c7f9664fd03
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to compromised WordPress upload storage. The presence of numerous links on disposable hosting suggests a phishing or scam attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160873bf4d9dba---43099232193.pdf
    • http://ownlines.com/upfiles/file/mopodominaruve.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1e473e332---45254546760.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d402693239f---tipipifulikigaledima.pdf
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/mezimiwa.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/kjtvf0c6j3epml5vfpmge63qk6/forovafuxekelure.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b14ad928c---gopenamexi.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/b717fc059e17f9c34b8273292d89df21/letuxug.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160750056f0f02---35318656147.pdf
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/63701259337.pdf
    • http://onboardviaggi.it/themes/userfiles//files/kepawelepubuvawo.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982de323ffc---midipipafox.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a1996d267---tapuwija.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c160b418aff---votide.pdf
    • http://ajarnveerapong.com/UserFiles/file/34912384608.pdf
    • http://blueyee.com/upload/file/260258041956.pdf
    • http://pathtojanna.com/userfiles/files/vawana.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/682bef1edb6badb213f8138d986ce890/gipebaduv.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/35ff6ac1d0ac0001e4e465c6355fdcf2/jodorutuvipuwoz.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ae918f387acced7428ca53799de55fe/22984100569.pdf
    • https://binarbaid.com/public_html/userfiles/file/60133171125.pdf
    • http://jpind.pl/userfiles/file/13833668039.pdf
    • http://ferrogep99.hu/static/media/file/dobevutofidegoxado.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608101b5a113e---pawakemuditekogasilovoko.pdf
    • http://ip-golubev.ru/ckfinder/userfiles/files/nuwokuzerogetumok.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8508388b5---benomidud.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=network+attack+types
    • 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_off0000fc7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7A 16792 bytes
font_01_sfnt_off00011491.bin
59b1e92c7a9bf69edf416a2c0e6b51810c737c77d6c8f32b210c4013e9a4530f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11491 10396 bytes
font_02_sfnt_off00012c5e.bin
af1cc120783728acf6fbefad2fc65835034f8589e209391d6ca256365795ea6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5E 16656 bytes