Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac15db581cbe6423…

MALICIOUS

PDF

76.8 KB Created: 2021-06-09 11:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f91282f5f22b99e85b0160b8fbe2ec6f SHA-1: 3774feadee08b52d1174c2eba28358bc56818355 SHA-256: ac15db581cbe6423101348bed01b15ce19cb8f41c4c1db4ff9f2f6102b78384c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm designed to distribute further malware. The document body, though heavily obfuscated, appears to be a lure related to PDF size reduction, aligning with phishing or social engineering tactics.

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://drafthe.ru/uplcv?utm_term=pdf+size+reducer+below+500kb
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737f85ad912---meguzodufuwerapafewi.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ba407fd76a2---mogagologusupokiraxos.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aaa6c219d---23963115778.pdf
    • https://contabil-fiscal.ro/mm/file/89650956981.pdf
    • https://camgloberealtor.com/userfiles/file/58047282715.pdf
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/lopumowizejodum.pdf
    • http://bulk-supplies.com/userfiles/file/92770165995.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a58ba1795---rusuredadanojowutixoz.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160938ad017598---pubujaxesibase.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d6782594---80863276304.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/mojofiwigegosidepi.pdf
    • https://yuss.it/file/59291296486.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/ae087dd5ef0621317abbd488dbc63615/55844637973.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4eb0d91c2---78026585466.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c6e855f8547668624a9b4981be222a4c/vuwunovonisobosojo.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd68056a8d---79448388735.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e147.bin
c4aad8ee933050fd29408bdbdee983ab74cb18c81f9c9deac8efbca86e1f18d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 5112 bytes
font_01_sfnt_off0000f2d4.bin
002d51a7ed95483afd498eae69e2cd739f09ec6e15fa8ddf27d2f7ab29f64cc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 10972 bytes
font_02_sfnt_off000117e9.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117E9 4324 bytes

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