Malicious PDF — malware analysis report

Static analysis result for SHA-256 4636bbfe9e4c2243…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 07:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d223acb050fd6a773a5bb5a5cfb3a321 SHA-1: 89d765e76d9d77b9d2ecb25e01934f9f3e22fc11 SHA-256: 4636bbfe9e4c224350a559e7f8d9c41a5136662b5016527f3db8deafeb7fa1fa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised WordPress upload directories and disposable hosting, indicating a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's purpose is to trick the user into calling a fraudulent phone number, likely for a tech-support scam or financial fraud. While no scripts were directly extracted, the overall structure and heuristics point to a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://granitnet.hu/editor_up/10997569971.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/ce0c1e36d86e30710ac4109a59f1abb8/5996342836.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98531f25b---45647069990.pdf
    • https://eminencesolutions.in/resources/userfiles/file/74163149564.pdf
    • http://dientrotiendathc.com/media/ftp/file/kuvizodoxalebipiwes.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e817382768---56471738850.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609dde8803aba---17200963942.pdf
    • http://ritadas.in/userfiles/file/tekibevawesupuk.pdf
    • http://refah4ter.info/basefile/hotelrefah4terir/files/1744532190.pdf
    • http://teknis.it/userfiles/files/supabulerigipubimamejolo.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160707e62b29de---gumakoxopakifa.pdf
    • http://hoanhaochemical.com/uploads/files/83764611422.pdf
    • https://beruanglucu.com/contents//files/42543096292.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/vqet8dfhehuoo3rukt94hk8m9j/getigesuwatemimi.pdf
    • http://happysmilecard.com/uploads/files/sumugoseforek.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/6cmqm5b4tuiuseampgv67thv90/dokunesigusuxutarevarewo.pdf
    • https://fl-forever.com/upfiles/editor/files/60948490331.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e5d78126c3f83929c72bba4791afb52b/nadatumejelowabedisanunub.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160859e08cd7ce---62139864069.pdf
    • http://hasyo.net/files/file/56186462914.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/e2583b6f61fe336938d90170b44afc13/lituned.pdf
    • https://raljob.com/userfiles/file/91724853424.pdf
    • http://innotec-industrie.be/userfiles/file/42697911388.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=volkswagen+tiguan+owners+manual+2019
    • 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_off0000da8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8B 16792 bytes
font_01_sfnt_off0000f29d.bin
af445378aabfe7d22192ca8408568bf0641d0c452cf444e605dfebd7e14b7eaa
pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 16880 bytes
font_02_sfnt_off00011f03.bin
6406614a505c21408f6ee76b448d54ca77894973799fac16f091190cbe357df5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F03 11160 bytes