Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f942972211e0e00…

MALICIOUS

PDF

86.1 KB Created: 2021-07-19 01:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffeed862a237298d24c1adb780364c14 SHA-1: d2dfa16b80ce2d70e92dca792f3c9284e9c8622e SHA-256: 8f942972211e0e00dd90a924a1dcde48f4e89acac227cfb37817e06d67a3fa34
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it's a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://duda-tech.pl/dudatech/upload/file/noluwopem.pdf
    • https://activsport.ro/userfiles/file/65427149531.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e88ccd790---zejasagek.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0352abb38---20596653880.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991b1f352f9---guwotimulapex.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d82a576ceb---gefix.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6g3j4ntugs367nkojr3nhr2510/83527857496.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/930043a56e8b43e90fdf943df7eb219e/80418301394.pdf
    • http://ajtoablakcentrum.com/_user/file/43701159965.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e6f4215266c6cfb7f5709bc51adee4a7/34645488243.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/d3223d8b53bc761cfbdc43dec584a2bb/kegewirinefusatid.pdf
    • http://drapa-technika.cz/UserFiles/File/13970286144.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/8aadfsu8vv1kibi0fbolaarsuk/63512320074.pdf
    • http://yjccnc.com/upload/files/20734194892.pdf
    • https://aznamaste.com/ckfinder/userfiles/files/32747765653.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f34b25b3e74---96455273965.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160937f9622a23---63535925056.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/wawarolu.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3f7998904---14595595635.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b7d2683ba---sipuxojevevatu.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/b6d00e934d7f6371a406ee0ea95e7b91/9402366934.pdf
    • http://eramaztravel.com/bot/ckfinder/uf/files/94247523242.pdf
    • http://ballarioarchitetti.eu/userfiles/files/kikezunerili.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/970e99f705ee04f1607f38d1fb8c3930/28951077829.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=freezing+point+depression+of+water
    • 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_off0000e99e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 16792 bytes
font_01_sfnt_off000101b0.bin
fc77c7f94b05c975edb6390390ce54e229a7f51742bbc9933aa02c1cd518f4df
pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 17704 bytes
font_02_sfnt_off000130b5.bin
50a7ef3e212776b28a0315af863f5b10ffd23d86f29087acbec43c01bc87cd58
pdf-font-stream PDF embedded font (sfnt) at offset 0x130B5 10748 bytes