Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f376228aebbfa1…

MALICIOUS

PDF

89.3 KB Created: 2021-07-18 00:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dab5245801664e6dde3073b1e1c92e9a SHA-1: cda1f529e330546cf9f5fd06ebb9b26a3d09caab SHA-256: 08f376228aebbfa1eb000f55a5f5c78504e195537d98a0f7d4910dc62aa68017
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The primary purpose appears to be redirecting users to external content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa5cc214e9---wipeveritapu.pdf
    • https://mk-promotions.com/ckfinder/userfiles/files/44312525995.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/24fd714eb5b601e4f2d1164cb02ef6aa/17615384492.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608e608d61366---12126731842.pdf
    • https://liniagdanskzydowo.pl/files/83241684735.pdf
    • http://hopkinshigh1961.com/clients/878968/File/35011152039.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/jafobixekil.pdf
    • https://xo-sound.ru/userfiles/file/87274298904.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/7cdd5167fc340154ba42bd9e279837c6/jevefixox.pdf
    • http://vizcsap.hu/files/file/12832427489.pdf
    • https://xn--80aaijzh9b.xn--90ae/documents/file/ribusesiweniv.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e4ed2877---42382953627.pdf
    • http://aarogyamedico.com/userfiles/file/jatisazorawusidi.pdf
    • http://tunglamgarden.com/images/fck/file/11859742675.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e83f7bd97---wiwiwabo.pdf
    • http://cp-tournament.org/ckfinder/userfiles/files/renamudosux.pdf
    • http://ecohost.ru/pics/images/file/xakifupapudafazanij.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/566h7jv447njf1uierced9pc4d/fonakavifudafolapopukuz.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160944a33d1c12---80759664516.pdf
    • http://ms-beauty.com/ckfinder/userfiles/files/mavalabagasalezuzon.pdf
    • https://seeandhearbetter.ie/img/shop//contents/49804311849.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=rabindranath+poem+for+kids
    • 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_off0000f9d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 16792 bytes
font_01_sfnt_off000111ec.bin
a1d6e1fbe5242d8b4329b229f4d470546465473a5f0d486558ded1bd8f28d604
pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 10996 bytes
font_02_sfnt_off00012b0c.bin
2d1019cdf9b1244c64ba7ae863afa3062c0cd48da50ba57c69d10f0d9d5b05dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0C 17288 bytes