Malicious PDF — malware analysis report

Static analysis result for SHA-256 68cb8b1752dbfb5c…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 08:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 137549b5aa4e84b7f1fda3d4569ab4fb SHA-1: a3f2c50ab8f5b529351e1e020d77ab16d57a8e23 SHA-256: 68cb8b1752dbfb5c9e6be380a428d8e141c8d9120d7c6bb3023dbf93ec7c2d7c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which are hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://acecaalcoy.com/userfiles/file/vemov.pdf
    • http://aurora-c.jp/files/files/31328491804.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab63ac1b018---33410610243.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989c2906839---kenusutemurid.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a67ca354e---zomesimuwomuxipizo.pdf
    • http://bannhuaduong.net/upload/files/vipara.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/659dd7b694590edae3ffde462f5255c4/mumavud.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e3482e6e617e1560692875fda2da6227/70795348964.pdf
    • http://talleresjpg.es/img/file/85987454940.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c7bc9056a2---jipilipijar.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160af920d7991b---63525005972.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/2j61bbcr1rgan94dt981aqdl22/felekemazesedukoxem.pdf
    • http://khotelmarket.com/FileData/ckfinder/files/20210619_06D889D30CE978E3.pdf
    • http://b-solutions.net/userfiles/file/20441581407.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/7badd74eaf19297d633ef1924c4563ed/mewuxizomaseg.pdf
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/22783514021.pdf
    • https://ctsgroups.asia/images/file/50015767434.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a814176bee5---mevitejogevibagosamupip.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16084658c6c4f6---50909030573.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/1faa89f25bf07190ba4e6bf56a9b19b4/17854731476.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95d0217c41---49767773081.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/3279cd91aab74b87d51bc02a1b61663a/65393452868.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081ffed88236---79794028122.pdf
    • https://aronabritcan.com/userfiles/file/buporozoko.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/573d732fe5932abc6ac787523847a9b5/8406598406.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781b1c78f92---xebofimafuru.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+umbrella+man+and+other+stories
    • 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_off0000e965.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 16792 bytes
font_01_sfnt_off00010177.bin
0c9019b5b43b301468166b2339a999da8ed9b69b3a5e33d9918d1985a1d26dac
pdf-font-stream PDF embedded font (sfnt) at offset 0x10177 17500 bytes
font_02_sfnt_off00012f2e.bin
2ce4f49fe72a433b4131c5e896df9736c7d1312dff576e60b109f0db061348dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2E 10716 bytes