Malicious PDF — malware analysis report

Static analysis result for SHA-256 29bef3be025ec02b…

MALICIOUS

PDF

73.7 KB Created: 2021-06-27 02:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9fc1ba32a89ddf5cebb8c9562fe6188c SHA-1: 07837189e0727f7bc1f929a9091a91160a23b344 SHA-256: 29bef3be025ec02b27b815246336140b1aaa4a4e49350aadc164b04a5ab9e60f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links are likely designed to redirect users to malicious or phishing content, aligning with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e1194d1a0---36101220302.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607923bfcc0d8---6073656446.pdf
    • https://pointvirgule.ca/upload/editor/file/63510912619.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d985e115f4---narebexikogege.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf86c023c4f---tosevitozusoniwe.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fd4a5234e---losodaxejujin.pdf
    • http://dichvutheapec.com/upload/FCK/file/59527767531.pdf
    • https://petala.gr/userfiles/file/wasinunovilelanef.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa2fbdd860---wuvakuzuzigawesiwa.pdf
    • http://musikpark-live.de/userfiles/file/48120976632.pdf
    • https://projectmine.hu/ckfinder/userfiles/files/gimudofenavatelod.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e790b1a328---10364025424.pdf
    • http://animalscipublisher.com/files/upfiles/file/26051022185.pdf
    • http://driver-jazda.pl/upload/file/34027983882.pdf
    • http://bobmeetin.com/media/galleries/files/napaxedaxabojubaxum.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d47bdb4139---fopifitudimo.pdf
    • http://svsteinfurth.de/radsportfiles/file/vofesewinefebutemomewus.pdf
    • http://fullx.net/files/88563831931.pdf
    • http://doo-san.com/userfiles/file/20210526091402.pdf
    • http://morgancountyoh.com/userimages/51534830157.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/bcbd5e01bab4c0bf3c06f7fdfbb5578a/81154344054.pdf
    • https://ringid.vn/ckfinder/userfiles/files/82919649560.pdf
    • https://samarpanbharat.org/trila/userfiles/file/7219751700.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/e6vmk94tl53hbi0muo3lo1ssee/bujitofuzesofunutijopopa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=about+to+meaning
    • 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_off0000c0c8.bin
14190bb18cdfbce43f07efece68c71c2d5a65dc41fd6ea6f135132f92de2ada4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C8 16160 bytes
font_01_sfnt_off0000ea15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA15 16792 bytes
font_02_sfnt_off0001022c.bin
8c17e5fd03f8f97b3786898766bec0ef088f45f5bff6e3761fa77fe772204759
pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 10356 bytes