Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8d40bc5475a749…

MALICIOUS

PDF

85.8 KB Created: 2021-07-05 11:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8aacbc148cdc9bf769e2238e635edcbf SHA-1: 13a7c7793b86e8fe22120858641a5264d301e9d0 SHA-256: ac8d40bc5475a74954768baa85ab5fd7ed01bf2c66075e097dd7cc65d7f26261
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. The file contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links strongly indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allytemp.ru/uplcv?utm_term=watch+after+we+collided+online+123
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e3891ce06f4ddbfadcb1bda1023eb6cb/joneviw.pdf
    • https://nestaerospace.com/uploads/file/fofijilojawejukana.pdf
    • https://wickedcheesy.com/images/file/parisewu.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dab341702e---77463393297.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/v2qv99ilnpn5ubnphrnplrmdt9/84964010922.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/54255713b59dc173eedc5f90ec4becba/27564916305.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c4472a3e4---bumes.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b59258c351---jikemewebozone.pdf
    • https://bandotrading.com/uploads/file/rabagasasibevegar.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160793ccd0b101---82682136253.pdf
    • https://produktybhp.pl/pliki_user/File/dalovirupokurojupavo.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/o44hrqoebtqljubroushj9pn4l/govuripixibubore.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/9cf67dff1ee50af3acdb8a0023766896/27458179736.pdf
    • http://sxhk365.com/uploads/file///bixupuzojigebi.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/4485f6f5b13d2685b9656eeb1662cc7b/95625098374.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8d0f87caf---malep.pdf
    • http://design-klasse.de/ckfinder/userfiles/files/lagetikonapadeke.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_off0000e7f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 16792 bytes
font_01_sfnt_off0001000a.bin
36ff5fca8df5cc3c137c610ee693d2c22ed667a8302218ff63cd182f74e2f1bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1000A 18112 bytes
font_02_sfnt_off00012f73.bin
e0908340d0ac80fd9ea693ffb55fd88aec5231978bd81006cf7fdff4038cfae0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F73 10828 bytes