Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61dab8c0dad90af…

MALICIOUS

PDF

89.3 KB Created: 2021-09-05 18:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86175159c24e4d59d15103f72b37d8bb SHA-1: ddc3d6894320ea59263025ec2d77b4fcd2e85d17 SHA-256: a61dab8c0dad90af84710efdb1780dfa14fec5b02fb8f125300d278c15b93b6a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://firegallery.ru/img/upload/65157214032.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd167812364.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b118985b37a597d8735bab0928f545d8/9057184796.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d8712f4cd21---29054781775.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///34244576313.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/wojoguw.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/pitexatibalibu.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/xarozifewomufo.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d22d385c9---69007631606.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/xovinekegaladow.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/keredenuvebasa.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/mvp0r5g82r0ul40vg404mrv8m2/36062424859.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/barisisivad.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/v7gid79g5ibr5uvrhpb04er898/24795815165.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fe5ea9208---xudigipizefimomokojibak.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/37ba4f3fa84096504cb08869e53f462d/48255727096.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/90139978135.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/belojurizaxaru.pdfIn PDF document text
    • http://kisito.com/userfiles/file/83226898987.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ecdfb6d0e---29441110416.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/0f68f738cf53a4ca90789909c90d9723/zupidesofedun.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/59386967862.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cec2d65ead3---jaxopew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=zagg+limitless+keyboard+manualPDF 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_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 19076 bytes
SHA-256: adb4ef5639fe300f22ea76bec583d6cf83a4628722c462dd03890f58a4736043
font_01_sfnt_off00012669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 11000 bytes
SHA-256: a27a1af6321e5121fde066104dc349b55d009e5a9141af300f062b7aed02519c
font_02_sfnt_off00013fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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