Malicious PDF — malware analysis report

Static analysis result for SHA-256 8959bdcbbb952187…

MALICIOUS

PDF

81.6 KB Created: 2021-08-21 09:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c11ea4a7b2c1c5dc1579b77d826e436d SHA-1: 568b30991bc2defdf6e96910c1fd9b52d8043cac SHA-256: 8959bdcbbb952187d50ff1db53b73f307fc50ffd37762d67898d12ad381dca46
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 WordPress sites or are part of link farms on disposable hosting. ClamAV detected this as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://au-coeur-du-temps.com/userfiles/file/31232417767.pdf In PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1626866264.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f27d0ca3221---52919826319.pdfIn PDF document text
    • http://namngonviet.com/user-/files/wuforazixakukumodukokapo.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/42137098723.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/39959662978.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfe0d68364---66349960426.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/silaroli.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/fezemanugik.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/97015563250.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/99325365900.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/danijufowuzetazo.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/82989792844.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/36721784339.pdfIn PDF document text
    • http://sjhtractor.com/d/files/2863543577.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608180ef6994b---vifopu.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/96946533478.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/wafijijasij.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/73af8f71d28b953ef1245b2eeec813b0/51247213895.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/512c6268a06a809b3a054e56b8f8cd75/56246113727.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/3d9a888761199c8b2ab108a2b14a1200/fivobakuv.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/a9b9aae924298aa20fd86bc7ee29057c/judigajogu.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fefd9d6b9f---vinovepaxolixitap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=story+on+honesty+is+the+best+policy+in+250+wordsPDF 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_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 16636 bytes
SHA-256: aab1881aad0cceebc850094d8e5c877e5e22330a4d61c2a10869db983408308e
font_01_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 11240 bytes
SHA-256: a518bdd27b552290357cf57be4e05ab06696c1daf21942de4753ea322c7e0ab9

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