Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b62753407e526d…

MALICIOUS

PDF

85.3 KB Created: 2021-09-07 23:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e6f1c845de024d2df619d3fdee39282a SHA-1: bda1a6d0a5ea61000bdb75993bda8f9e6071039c SHA-256: b8b62753407e526d0f06f45ab3977250834d0cd4cb3ab213763c81439724f036
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://allytemp.ru/uplcv?utm_term=sqlite+python+3+tutorial+pdf PDF link annotation
    • http://lsmtrontractor.com/upfiles/file/20210902214746.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/be9bca38bd8be1cd7f032f6ff11ad4bc/modak.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/34841649035.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f3e8c4cff---ranuziw.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/72570252044.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tagujokobes.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5988922c9---kavovafojemedetovar.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/67f5455aa4b5a456cfd480f7c0b58a99/6545583731.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/nogesa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd5954578b---58354249764.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105171057.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/05a4421fb169cd41fc2f0a64c86c7072/vebesudekupivul.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39d6193b07---sogumuludazolutufot.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d69dd5f21---vizuvurateverazejoxuzes.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/t70q9pkhb4cn6kcphm76gif6fo/pulufutimepojul.pdfIn PDF document text
    • http://cortabellanews.com/userimages/fegexoxuzujivanajuzu.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/27094396153.pdfIn PDF document text
    • https://qkon.ca/images/file/gesizu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160acac0ead0e8---27402321343.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/kujotoburibozunuxaxironuk.pdfIn PDF document text
    • http://mdtrend.hu/files/file/17058831545.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609c20168ffa4---30794767078.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/jivemovoxerulifotusonibuz.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/49f038229a6cf3e54b1d66cc06d64ac9/gapabaru.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/t19vcgl12a6sekt5kapmvc94p0/nusidogonikawepiwalipux.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE574 11032 bytes
SHA-256: 48d6e2bd6e85407f66b8adca7c69c45679459eb7b74eed27e69944f6a067211d
font_01_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 18644 bytes
SHA-256: a4e22e3bc11d0dffb4099adf5dabab69698a8bf252124c200900d5965b1246aa
font_02_sfnt_off00012fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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