Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10fb4662de3b683…

MALICIOUS

PDF

90.4 KB Created: 2021-07-07 09:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4c9b6e4a9bf23d11a3cec8f9e7b4fc9c SHA-1: 159b37de0299d5959dbaf224b8c31e986593e9e9 SHA-256: b10fb4662de3b6832ee6833c530a484d7ada83425a32107820a4ac282518ffe1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://infrive.ru/uplcv?utm_term=wrestling+game+download+for+android PDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3127b8f9e96d1fc93ecbd0ac125322f4/kivubabanizotorep.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/vomepizezukemamos.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/0c89b2a480d99dbbb9b3c832cb2c496a/wabumedos.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/82101446872.pdfIn PDF document text
    • https://unosms.us/userfiles/file/72065404229.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/1qfn3fsp3jsjvgk1criuvn96sg/10404377953.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ivt9dis5jofij21u0fm4t32fs5/larogezatebewon.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16091d8ce2ec3a---rotog.pdfIn PDF document text
    • http://candientushinko.com/images/file/zosiwomilinonalev.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/4557c27c443cad1e05cea3b48c397380/fezopowoxakaluzokogeder.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f460466e03---94655091042.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbcf6588f7---texoxusemujejogofitoxi.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/8efdc481e0b7539533343909211fd623/wovumo.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/e94fae78b5b74635dd36f20b20784a56/83886911042.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/82522502059.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/5296692123.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a04f776de999775f38d200eae67021e5/35144134307.pdfIn PDF document text
    • http://leesfeest.nl/leesfeest/sites/default/files/file/27169849565.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad3377d823---satibiduz.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607050debbbd9---90836039794.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/22061261889.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/5167b7484750e442d25766135ba1553d/lepewag.pdfIn PDF document text
    • https://lbassicurazioni.it/file/kiberovibutixikegeje.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_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 10776 bytes
SHA-256: 2873c420e579a077a1bb6da3031eb52c5822c72c0ab2729ae96b2f7792ddff19
font_01_sfnt_off000118b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B1 16684 bytes
SHA-256: 676aa5d44fef3f428151645a94658f968fc791d02a8abeae9714a567afc182a6
font_02_sfnt_off00014428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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