Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce4b7eb62a4caa8…

MALICIOUS

PDF

95.7 KB Created: 2021-07-01 23:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c93ab30e6b2b047159a76b0b6952761 SHA-1: a179b1eeafa0c90234aa9e340dddcd53c9f9d963 SHA-256: 3ce4b7eb62a4caa84ab27d0c79f991aaa550924c6a76c95d6a4812149ea3c63a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, specifically utilizing the FormCraft plugin's upload functionality. These links appear to be part of a link farm designed to obscure the ultimate destination, which is likely malicious. ClamAV and ML classifiers strongly indicate a phishing or trojan payload, aligning with the observed link farm technique.

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 https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160818bd5631bb---pakamu.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd2860d9a---lisuravizexakoxokufijav.pdf
    • http://turatabor.hu/media/xitenemuku.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a48515d801---75184765926.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/tict5tjuo02fna4ubktc30310j/96321218619.pdf
    • http://www.rotudavid.com/ckfinder/userfiles/files/84646821380.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/j9vip06ehmg6jd4u9i2qvu1hnm/gadovegagesojoxanirifuxu.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b288eda0a56---64117983896.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/3f4a13c12653b45005c368aa19f9a7ff/zaxugaxi.pdf
    • https://myphi.biz/nbloom/fckuploads/file/90891936975.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/bd2e23180bf9e44dc8a458534cbf19f4/39998516118.pdf
    • http://cappellastudio.it/userfiles/files/70025852565.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609621aea444a---mifawupikositu.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cba10a22f---rikunemavu.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/gler05h3egjuaa4klg0kfp4o59/dopegika.pdf
    • http://ya-ke.cn/admin/upload/saporonifizaga.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ebfd249287da49691a66121141ba7b53/fujimafururalon.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/34360272316.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf23001c4bd---93217937676.pdf
    • http://bioident.pl/photos_fck/file/xedubofix.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/r83kbm6gm81129leiet4q33ff7/60457769915.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+flesh+is+enmity+against+god
    • 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_off00010bc4.bin
6e212ff9b0e72e55feaa238ee57dd6b2fcc4819dffc586fc456fef872ad6821b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 10776 bytes
font_01_sfnt_off0001243e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1243E 16792 bytes
font_02_sfnt_off00013c50.bin
7f98e69f6ee6468418b9ae8d0f195e6bd85d99b199b79b7f6d02edd26288fb7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C50 20444 bytes