Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84df37796677fbf…

MALICIOUS

PDF

83.1 KB Created: 2021-08-21 07:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f668c6876a40bf13178bc3a6bc0fb256 SHA-1: e1fa0ab77691594c32fbed62fa7407239c175e84 SHA-256: f84df37796677fbf0f226c17f84440c9571d80aa4264adb5edc8b1277336d186
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbeb387552---jomoxipavezego.pdf
    • https://swift-tw.com/lcc/upload/files/88183366496.pdf
    • http://toshiteriyakiburien.com/uploads/files/40057702368.pdf
    • http://abwferrellpkwy.com/uploads/files/79029482410.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a151f79b08c0c20279cb0380d0467f89/jagamugexobusufinapiwob.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/gagolilixaxuxu.pdf
    • http://polins.org/public/userfiles/file/68432013103.pdf
    • http://yuemeism.com/uploadfiles/files/borevipitu.pdf
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/92458918358.pdf
    • https://amitadevnani.com/userfiles/file/fikigotejisesosejunefuwin.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8559c35bb---13861170250.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095fea65d8e5---75150448307.pdf
    • https://et-auditing.com/userfiles/files/gojevaf.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/d7cdbc0806620398c88b6e53d0a6c4e3/gegokugomisiwutose.pdf
    • http://barrybusiness-crm.com/ressource/devis-photo/files/55910700796.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ivkev0p1soulsvvhav550487gd/14580824857.pdf
    • http://constantcontinuity.com/membership/data//files/zexefebitimilo.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160812c148c73e---rejifijavemipikuzo.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/20a1a24a0022d92f0035da8acf932f02/28198471635.pdf
    • http://vina2002.com/uploads/files/fagodudiwagonizepawav.pdf
    • http://zhouzhuank.com/v15/Upload/file/2021630161389925.pdf
    • http://wych123.com/upload/files/tumaniralaperenuloluzox.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16099fd7ed8804---nananagovejevomo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fsx+beechcraft+king+air+350+tutorial
    • 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_off0000dfc1.bin
d53b0db78b2532e9bd34bc1b911100b453c169d11bfd5b273d1a37efde25e82c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 11452 bytes
font_01_sfnt_off0000fad9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 16792 bytes
font_02_sfnt_off000112eb.bin
3928b979356d17e61fd9f6f190f60ddafc467a12a9ff409ee59ca62fbba5a937
pdf-font-stream PDF embedded font (sfnt) at offset 0x112EB 16376 bytes