Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde029baf8640076…

MALICIOUS

PDF

144.2 KB Created: 2021-08-03 19:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09a875afe4a2130922e27498251d014e SHA-1: 95a0dc65f91bf2ca5f04a5446b3c886ddcb54f6e SHA-256: cde029baf8640076a38c9f609cc7d3cd3e15ca542f5e675903498bfecef1162b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains identified as disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://thedewakohchang.com/image/upload/File/anigabojepivut.pdf
    • https://intellicapital.in/ckfinder/userfiles/files/jenojoz.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed15d54160---furazabu.pdf
    • http://brilspa.ro/userfiles/file///momolugudokolulibeda.pdf
    • http://fullx.net/files/72421549872.pdf
    • http://blueyee.com/upload/file/150703558287.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/2decc19e8dfee4d0cfe2f955c11c926a/86014864348.pdf
    • https://calendarsunrooms.com/userfiles/files/19576048617.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/mhmv7h6pepqldtseggdefnc69v/nesegekifap.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ed98fa7c24a7e8fa25b17342b9904ed9/bulirasad.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b673961389---baxabu.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086cff7351f4---43559432534.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/5f3322042cefd7920ca4339c6d744f31/tugaguxelenab.pdf
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/geporifonoz.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0a95d89e449e2fee8814da2b6ec755c9/79192379630.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/44b8d900dfc574dc93541d08fcf12c97/tokijo.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160adb350a24ab---kusigidajovalenimufi.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/05385c8d1cfcfbc8efa8c840378cbda3/koxibitabaxekopikekokiti.pdf
    • https://resonanceacteurs.nl/userfiles/file/duduvatesatoxiluni.pdf
    • https://coevent.ru/upload/files/22744113250.pdf
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/fg64n4tumr6klh52dp02k97qem/82722249356.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/653e7adba7ecaf7ad95a47e870c2b718/jaridozemug.pdf
    • http://amandatravel.com/userfiles/file/japaroratovapesoxep.pdf
    • https://fisheaglesafaris.net/pics/user/file/39914384919.pdf
    • http://flatadministration.com/uploades/fckeditorfile/putaforokugenekajobufojif.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=lenovo+yoga+c640+review+cnet
    • 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_off0001cf8e.bin
af947213003770cf23ba48facea047bb847e23aae284d3744e8e39fc2c77dc32
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF8E 19088 bytes
font_01_sfnt_off000200f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x200F8 16792 bytes
font_02_sfnt_off0002190f.bin
bb295e2b633b8bed234fcc5659f93ba38bbcacebb60f7cf67ee377d13e2ee5e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x2190F 10784 bytes