Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d55548ae4bca2b8…

MALICIOUS

PDF

82.5 KB Created: 2021-06-25 13:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65c05300338204af3aa8c8551793e336 SHA-1: c046ff83415ea9364affa0cee4aff4e876610c3a SHA-256: 1d55548ae4bca2b8effe0a1d8fe79ead2d3a69472a2a6aef9a5ac5e58e5453c8
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating phishing and trojan behavior. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further indicates a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/uplcv?utm_term=to+back+up
    • https://virtualpulse.eu/UserFiles/file/purujemeromogo.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073fcfc56d23---14525759497.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e330863936---merakupajubosixuga.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/83ef5dcba7f63bb381af3c62751d7d51/93000308979.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608770fa6008e---29586195092.pdf
    • https://renebeumer.nl/userfiles/file/tefonufedanugox.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087d438d9cc7---99628191107.pdf
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/fubipepepifigazidi.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/p616krn7s38uo91jf4gkvmhvm0/samesuwiwameti.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/b795f7097885a61075f015a0d175ed9d/zuwagabojavigasu.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8c113c3ce---58744191722.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b24d12d9ef1338b500dc602d639ed631/65844798198.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/0f91d32abc50fe1a386d74fdea0fa0c2/53341815108.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_off0000e0a0.bin
aff8d9f85838717bf73cc2ce8220cbc9c22388897e0b81c0e316898723b48d97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 9924 bytes
font_01_sfnt_off0000f672.bin
675173415e162f103b07456f3c104cc86690f15c60630f0e17ebc26405e18f58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 18488 bytes
font_02_sfnt_off00012632.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12632 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.