Malicious PDF — malware analysis report

Static analysis result for SHA-256 1113bc2bc838de4c…

MALICIOUS

PDF

69.0 KB Created: 2021-06-07 18:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f784e87b78b2a3e773719a9f44d7a4b SHA-1: b204f6ded9510d61e5395e56a7c3e901acc68940 SHA-256: 1113bc2bc838de4c59873e4712d8d6ea6100e19625ea438aaf8b0ab7395c111d
156 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs that point to compromised WordPress sites, suggesting it functions as a link farm. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to direct users to potentially malicious content or phishing pages. The ClamAV detection and ML classifier strongly support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pixomot.ru/uplcv?utm_term=100+mile+training+plan+pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/v1f72t0ev7p4638c7ktok15o9k/furedanijotexoxejogusida.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/dbcc60efc27b38f924c9b66a23fa390c/6585552517.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608248b9a8f9e---ximedajimirewawobad.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/3in4buieo684ho045sekk6uqh5/meromutawose.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/pvo2v9g85ajpr5b558glr1hsnq/bafigajilut.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a149df74758---21741737228.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/a634dda91299411acf717f9299c3da02/23048878349.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/640bc433dfae59cd8bfc3463f1036925/47265954752.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/l3rip7g9c31pd2ks177bm3mgha/137887178.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608757b57c951---lasugikofupuvudilel.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/1a387d47cfd84c8c68770788519f954d/96161667448.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b19643c8fb---safukajaguzasamovi.pdf
    • http://pileshoppen.dk/userfiles/file/mexagibuwakex.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886c1706abf---96073691285.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d248.bin
027dcd9222a957ee64d5bafdae7d41494c73f15cda30b3d2023bcb4cc244d77a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD248 5280 bytes
font_01_sfnt_off0000e42b.bin
7ca88345497e85fd1c91ed366768ab19f590e5f38489affd1c3049513d4357e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 10340 bytes

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