Malicious PDF — malware analysis report

Static analysis result for SHA-256 709f662e257aab6f…

MALICIOUS

PDF

90.1 KB Created: 2021-06-27 09:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1e8bab76391dd1645172f028fcb3755 SHA-1: 94d2c49ffa266fd99e7baa839631c60a1790f23a SHA-256: 709f662e257aab6f36db407e2ed24072b5b5d287b0259e5daf0357078e06aa70
96 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple links to potentially compromised CMS upload directories supports this assessment. No scripts were extracted, but the structure suggests it's a lure to exploit vulnerabilities or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/3d4ddcd2dc22713ac324f3e21711e336/84140170226.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/pib1m0nl7c7jkig6qi1sq5uss6/78921506597.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072f67d26fdf---75355883725.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/o4np83m191t408air763ebvr3r/55306587311.pdf
    • http://farmina.ru/uploads/files/fiwelevi.pdf
    • https://irantruck.ir/data/file/57590029764.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f852f570bf---datuvirakajonagirovodukej.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a417af8078e9f60af597b16b15cb85eb/fedoketutisuwibilinekaw.pdf
    • https://agmatbaa.com/upload/files/77649917771.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/a7de6beedfd7f6e39f18a4e93900cf1a/97826067727.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ao7heb4teen2ikpajismrb6g63/32466815511.pdf
    • http://dahchen.tw/userfiles/file/32366626277.pdf
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/ugi0tc2lke7ut804jmifjjp0i7/natub.pdf
    • http://ahlhy.com/uploads/file/300534267716.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/pf8e7393av9jg4vqhh7g85fs53/mijagalefumu.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/98234945649.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7c1e1291964b7f0e7c97ed5b8855ad27/razezel.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/j8imasukjvt20uco6qm94vah22/1179435710.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841dbb7dc73---36694305429.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/f3497efcc414582657912cafa608ff35/fotoxogajatu.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/592832082118761d155694b50ee3ab56/78493915441.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a14cf166c2d---93889361930.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0973ede023---30905701166.pdf
    • http://ccswcd.com/userfiles/file/vatuwuj.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a30bff91c30---70717350332.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607325241a5fc---renizig.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=nasal+congestion+mucus+in+throat
    • 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_off0000fef1.bin
06f61d05085c875d934adb8931f378a713ceef9cf03ea996116b77eff7fd9a5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 10752 bytes
font_01_sfnt_off00011781.bin
0966d179a0edd6f3dd4c3836ba9ffced82b47aba66f4ce4a303fd5f3bdbbe20c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11781 16712 bytes
font_02_sfnt_off00014301.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14301 16792 bytes