Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbae8cf7523e342d…

MALICIOUS

PDF

87.2 KB Created: 2021-07-13 16:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbf33d278c136b7eba97d81e2a237093 SHA-1: 564ae343e585a1024cca0c2ed7656a117b29f108 SHA-256: fbae8cf7523e342d9fa99d5057b1b693bada3c5b66ba3ac50c231a13ed978c61
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://satisfytech.com/ck/upload/files/5000486476.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/suzamidupuvakivubome.pdf
    • http://renovator.cz/files/file/92484067896.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f823d556e5---78913922028.pdf
    • http://krukewittfarms.com/userfiles/file/87136233425.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd8636a104---69163934910.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/72g16lai1uglpiisd9uu48lih6/kewotiv.pdf
    • http://bodegaadrover.com/userfiles//imagenes/voganolibipo.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/8b2a721409659aea5d1a65b5b2abb361/bizur.pdf
    • https://elsa-daulte.com/ckfinder/userfiles/files/44259064560.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/0bl1pf3g6fsirjkciojhj57fkf/tukawil.pdf
    • https://fruzsiflame.hu/userfiles/file/24115185234.pdf
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/67629549025.pdf
    • https://irantruck.ir/data/file/vaxuwufibusixenivinufalug.pdf
    • http://basaritarim.net/admin/editor_resim/file/30885566619.pdf
    • http://ecole.ru/text/images/file/80824306499.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081427318be9---zalubudamuxiku.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607828e98a095---82438415317.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qqhvksbgaj9168m6lqi8umoj0d/84382322612.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2786e20ed---dojoleremuxa.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160acfc1ae9f0d---jexixipunezawotabuluno.pdf
    • http://bafiti.com/sklep/userfiles/file/novim.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=time+and+work+notes+pdf
    • 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_off0000f19b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 16792 bytes
font_01_sfnt_off000109ad.bin
d7800fdbb814a9020d582c3270477bb56b307c316e88f2afa868dcc53fe698c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 16876 bytes
font_02_sfnt_off00013564.bin
7bf0c63e07d65dda1521fd231e2dc00c517a8ac743aa1aa633690313270753dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13564 10752 bytes