Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac55ff4ef7dfcfb…

MALICIOUS

PDF

109.7 KB Created: 2021-09-05 10:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b21685f6dc9e961e0442c9546b35b2b6 SHA-1: 2dafb5db63b2e85f9f51a0daea3778f425c45c82 SHA-256: 0ac55ff4ef7dfcfb0dfbe27f2484224aa6f7a944c9eb8ea6bae0a5b80d4e78b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to compromised websites and disposable hosting. The embedded URLs suggest a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector. No scripts were extracted, but the PDF structure and numerous external links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://pistant.ru/uplcv?utm_term=go+video+vhs+to+dvd+recorder+manual PDF link annotation
    • http://roomyab.ir/basefile/roomyabir/files/nekej.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/26036316781.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/48344956034.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/iv63ag9kuh4159ghp8ihhe6d94/10260347233.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021071411010895.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/duxizekufimukuxitufatup.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/xerobusisavebixifup.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/25873320675.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/mofiresugixosafu.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/27633810393.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077bd1a4bf8b---tujaxapurixe.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/22359719441.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/a5c1f4682914d9e4d95ab2815dad11ef/biwawejezugujulobuwidokad.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/98996268367.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08f6fa6638---78429368479.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/20287062196.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/fifozo.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/38177784809.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/209d38d8f9ab8b89930d30c2e588858e/xoritibemokukovuvonunol.pdfIn PDF document text
    • http://abpaluso.com/upload/file/26101825119.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5a78bca0aa06fa668cc61d2984c8929a/84805747547.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/52966135505.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001464d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E64 10840 bytes
SHA-256: 8c0f2490b6383a9cf7e4394fa212f8d1623d83ec5059fa3bf62e3b1fa3ec37df
font_02_sfnt_off0001774b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1774B 19268 bytes
SHA-256: 3bb55d6d616b386a6f4f8a21771d4f20400a1e84d2d384535bc2059aaef77752

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