Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd39f6441d4e274…

MALICIOUS

PDF

126.3 KB Created: 2021-06-28 11:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd316b0a03faae42ad27acf4aee686dd SHA-1: 1c1aa117b7cd9fa3a76eb1197759f2ae534fe2cf SHA-256: afd39f6441d4e274972e38ff9be3ea85af7a3665f1e484777feb9b44921be1cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and link farms points to a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9635

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 https://infrive.ru/uplcv?utm_term=sinnoh+map+with+names
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/796f20ea967c36b55299db4f0ca08afe/3066499945.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea47068cd9---40140165171.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8a5d24750---62080178954.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f1a8bf8fa80a3af6db602a31a4c9fb5f/budupeximabukoxuxavub.pdf
    • http://moon-villa123.com/CKEdit/upload/files/62212003966.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f75e2d300---81189986931.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/627f690ee1838700c8b5ae721c28d255/26645949118.pdf
    • http://accountingworld.in/singhania/downloads/file/lakogutapubilolafa.pdf
    • http://kursadowicz.pl/Upload/file/zezef.pdf
    • http://homenet-spb.ru/userfiles/file/59090039844.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/f2kqrcn4lskgbrupfshe0337co/mokugufibure.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/c86b3916c78bce81e9aaf73ef858523c/texulosadavudes.pdf
    • http://ajisushionline.com/uploads/files/36883205342.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16077d854cf7fb---20379756526.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4da93c72b9---5092290015.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609279d1d96bc---zamutazegovamef.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d20e55c956c49218c3538a32300d86f8/57840762926.pdf
    • https://sunarchegypt.com/userfiles/file/fuxazepivetif.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f55857835---18392470110.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca1c16fad3---muzimoz.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/cc0d0e4d1c186383f9af81d04ebc8cdf/lusagumeremudok.pdf
    • http://dush-kz.ru/uploads/fck/file/47532628046.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/96864221d862b4becfac2b0e4b81731b/19620656811.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0610915bb---dowis.pdf
    • http://cheers-gifts.com/userfiles/jepelakizijodilase.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016375.bin
cb0565a9f43e959ca2fe1aa8ebba08cb23cc12d96d7cdfaafd142a37cda78746		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16375 10532 bytes
font_01_sfnt_off00017b4b.bin
9feeaebfa0419163f24564daf0d397ec426c5494d816243492e9ce2056b526f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17B4B 16760 bytes
font_02_sfnt_off00019347.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19347 16792 bytes
font_03_sfnt_off0001ab54.bin
392fb780972dcf5e9adff57bc88ca09c045ec6aeabae1f8986e97180eebd6b38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB54 4320 bytes
font_04_sfnt_off0001bb8a.bin
3e3835a4fc829bc860feddb1e92fc0e720fa536f47fd0cb1eeb78a1b18749cf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB8A 18664 bytes

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