Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04a69c2034ac262…

MALICIOUS

PDF

75.9 KB Created: 2021-10-06 15:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d6d508fd593d12751109943ca408bce9 SHA-1: d32b03ce612b080ff80bfe4fe16a29869c2019b2 SHA-256: d04a69c2034ac2624445345bc5b3899867457e89ddc888e9f22cf0693c24f95e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kimbuunguyen.com/uploads/userfiles/file/74169177979.pdf In PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c469b9646---34051588262.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/2099712334.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/73317581288.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/75188988813.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/decaeeea6eb21d281757ebf1d712c65a/4861280033.pdfIn PDF document text
    • https://viceda.com/userfiles/file/30269472128.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/4077032568.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/fatab.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a1717d9488ecf9648d49f54f302dfcf6/66277642874.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/64513122102.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/87682955393.pdfIn PDF document text
    • https://atlantidegattico.it/file/fenegi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/280ca49de505d9693fd3497ba80dee22/robibomozuxuvimonimo.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/sonepisura.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/xipoxobodiwedasoporafodur.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/wasepomisewezala.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/xiduzowigabajek.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a4828860bfb3221de8d19970eb59cb19/79873903776.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/98586289528.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/24687701396.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/juwolinopogaraveludaj.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/dekikuzo.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/52505409136.pdfIn PDF document text
    • http://www.moyekolodin.com/files/japiwopogudexada.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///bikokuneduxi.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/2448197101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=camphor+is+good+for+face+skinPDF link annotation
    • 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_off0000c625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC625 16584 bytes
SHA-256: dac116a8eef3b6efd95c3e2faaf86320bb274c062929a5b9f457107b7a047d53
font_01_sfnt_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 11048 bytes
SHA-256: 7617a3607007b229e832420d3ce55c6ff4c2cef3b65465698fd004ab30e5ddf2
font_02_sfnt_off000109c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1