Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5dcd4a82659dd61…

MALICIOUS

PDF

76.5 KB Created: 2021-09-01 16:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa49f26d8e8688303946f8cef3ae5af2 SHA-1: 1a1cef8f3446c6241b1db688393bc08e4fe16d0a SHA-256: a5dcd4a82659dd61fefe8511c15c32284bcbb4301b40516a93eb9ddc252e2944
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 external sites, including compromised WordPress uploads. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jyapa.com/jhuoyue/uploadfiles/nanigimukibijugevugere.pdf In PDF document text
    • https://avayemehr-carpet.ir/data/file/tuzowibefurezujo.pdfIn PDF document text
    • https://retta-bg.com/userfiles/9382699038.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6d20b85bf---rituwilubakizisulopidij.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/pogovopevojijaterovigukol.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/fewakojigo.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/zarijanosikotirixogewab.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/dipebolom.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161253bda459ad---pikogixowekupugunekules.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/penezerosafotojemonup.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5788d1a2c719d34866b3a90b5532c728/fadigugigivawikuvizixok.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/muzevitavusi.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/svdko07uq3far410i4tr3de2ds/71908807551.pdfIn PDF document text
    • http://3q1p.com/upload/file/2106241257518750013prbg4c05yla.pdfIn PDF document text
    • https://khanikango.in/file/somewelud.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/1416992740.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c25351372d1---pabuwef.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e9131831cd7---92514507213.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/49658578534.pdfIn PDF document text
    • http://meadspool.com/clients/8/8e/8e46726fd42f39913d2349bbdb4e70c4/File/69076071725.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e82baea19b1---5756800862.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/5f375b057ddac6a505ce78112fa3a1e8/3948583283.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/7g9mcn6cmlsdrug9gg30l1jjr3/donudawoduguzupe.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/dd957e043767d79e7505914ea3b9ac42/60065504672.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/vazaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=are+gateron+browns+goodPDF 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_off0000c906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC906 16860 bytes
SHA-256: 482a1a2b7562f72116b2c7b8767886c84dce0dea1cb272bf6db4d6d3c022e260
font_01_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 10492 bytes
SHA-256: 24bfa77228a50968921dc91b9b7d2e4138f8f91d3cc17f946ea81940b215ec0d