Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4e4116430426b3…

MALICIOUS

PDF

91.6 KB Created: 2021-07-18 15:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c72484e19d3af6f9d8dfb009bc34fa91 SHA-1: 329a461462ef45979816c8156a2451789f1c1b8b SHA-256: ef4e4116430426b3fa056f9b29082b8b31f272d517fd795aa3257c281c959a00
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/34925863067.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/50520628272.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85209be4b---44620303368.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0d2a82f60dda04a8d3d06b079ce3835d/15291546340.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d17227d04a---xisazelokopit.pdf
    • http://klubbelgickychobrov.sk/editor_uploads/files/13960213404.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709072f4144---sosivigisoxifaridep.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2130b16104056ff80e09da5f1f732113/lerudug.pdf
    • http://vdadanang.vn/app/webroot/assets/files/66604136851.pdf
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/49202581898.pdf
    • http://nowator-zpu.pl/userfiles/file/19649343615.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/7tk0309s3ovh80l6rakcdbpoj1/47922101369.pdf
    • http://effektfilm.de/files/file/86112948619.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/mrv8t10b3i0k99vud8mqlr292p/31052580192.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/06rkfcb0bf8cd6qe919td9o7as/rotumuxolewokekukawiju.pdf
    • https://motoquadro.de/userfiles/file/giloj.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b585c12ac2b---77423166770.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160807738e07c3---jamofukokurukedazokuje.pdf
    • https://gadd-asso.org/userfiles/file/75918286245.pdf
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd4d4dbe2---60007595031.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=tube+mate+latest+version+2021
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df01.bin
6fb6ac1cbadb24f79f54c9a52ee53b22fe5be79c27a0c132ba9acf83f3f7d7c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 17112 bytes
font_01_sfnt_off0000f7c7.bin
42ce40b7a67545d7a12c3e7149e833b673258193c54ace1c6b16c34a573eb4d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 10832 bytes
font_02_sfnt_off000110d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 16792 bytes
font_03_sfnt_off000128eb.bin
3096ceab70aa9ed3b136cdd535c0f862167dfb47409fdd2329f5924353a3aee3
pdf-font-stream PDF embedded font (sfnt) at offset 0x128EB 22076 bytes