Malicious PDF — malware analysis report

Static analysis result for SHA-256 763c29b806e1f2aa…

MALICIOUS

PDF

84.0 KB Created: 2021-07-24 19:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12779a84281d7d931a907199df7f99d1 SHA-1: 0e7fd3f9e74d21e57feda942efec24e544b9696e SHA-256: 763c29b806e1f2aa61795aafc53fc897c3b24492600f55a485fc367fd37b877e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains a malicious payload. The document body is heavily obfuscated, but the presence of numerous links, many pointing to compromised WordPress sites and using UTM parameters, suggests a link farm designed to redirect users to malicious content. The primary attack pattern involves a phishing lure disguised as a document template, leading to the download of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://skyline1968.com/clients/74864/File/40856689925.pdf
    • https://campermagazine.tv/public/file/5250813570.pdf
    • http://faradbox.pl/files/file/vokowevaxosamikokobad.pdf
    • http://anthonyvienna.com/sites/default/files/file/38382521526.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/ef0d6e200dbb5cee3254ee269e45e31c/wepepetunubosabazazur.pdf
    • http://lulanjina.net/upload/files/74606758904.pdf
    • https://bakotech.at/uploads/ckeditor/files/dokoxemevuxab.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d912c8bfa---53643513998.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096c7b30d1ab---baluvisotibanemamo.pdf
    • http://automsystem.com/UploadFile/file/20210504002738775.pdf
    • http://gorisum.net/fckeditor/upload_file/file/27629833691.pdf
    • https://cardion.dk/gfx/fckimages/file/betexeviwotadobejurorijo.pdf
    • http://geodavidepini.it/userfiles/files/22115720796.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8b7a077f---90104923838.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/dba8d96aa25fc9ad24dd80fe7f5c053d/gexilovivapuwafigifu.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/95519076771.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/32495075497.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67bcbb2b2a---wijinuwokolonobe.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c5392dc0bc2---39284612895.pdf
    • http://bualuang101.com/backoffice/upload/files/73288346955.pdf
    • http://cainghienbinhduong.com/uploads/userfiles/file/24685175416.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160da70064d0fd---xezes.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/bvqnqg88katdkebr4eq1pmcql1/suwokelilusivos.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/kg7cn7qfpslk5t6d1rb2jjjdc5/dokumifevuferolo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=descargar+formato+de+hoja+de+vida+en+word+gratis
    • 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_off0000dfac.bin
d28acf4a0cd6870fc7faad6f996715ac4d8bc03343999b055f779cd9aea0587c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 18228 bytes
font_01_sfnt_off00010e5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5B 16792 bytes
font_02_sfnt_off00012672.bin
e6da5f0ef87e1f963d0499b60ac8387fe53002a044ce1a2d554f9a86a3767d30
pdf-font-stream PDF embedded font (sfnt) at offset 0x12672 11160 bytes