Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab063c8835d6912…

MALICIOUS

PDF

90.4 KB Created: 2021-08-08 08:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 82e12965e9bd5417e48ca80a44866d34 SHA-1: 8e85c3550210d1baf8fa4aac9a08a3343b32bd69 SHA-256: 9ab063c8835d6912c43b682392d43854fd82ca77b5ebb6425b4152bdb1944b30
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this file as malicious, with ClamAV specifically identifying it as a phishing trojan. The document body is largely unreadable binary data, but the heuristics indicate a link farm designed to redirect users, likely to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://alarouba.com/ckfinder/userfiles/files/kikodakukifuwabol.pdf In PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ckqrkbggj3crte4ufiia8il13u/kulidovomiraromuma.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/36692979231.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/106af8fe1cd7d6d2c35e3afb5fe6efc5/66946400469.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/3434884e53ecaf2a101f9a623cf89cf2/jiwidawajezejunozaki.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/rufesofovaramogidakil.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/46t83qkl5hltlvdca1e0qs3fmu/zowixipijewe.pdfIn PDF document text
    • https://laser123.com/geektic/files/14951835134.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4dd0e87f5---72061987035.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/libovezijemefuvepoz.pdfIn PDF document text
    • https://chptravel.ir/data/file/73444830636.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/cf65bdb180712c499ea1b0cdc67e1aa2/62947121171.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/gdpb7c1gp76p9g3bod48cgo2nm/66982690391.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d67027ec80---54727228633.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/witevovijidipulufaseku.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/gevifoxavagabevefarigoj.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160965b8b57e87---losiluluvutumuzopidaru.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f0d31f044a---31921383431.pdfIn PDF document text
    • http://hanifeugur.com/image/files/wubufusetuvoj.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a491fe146da---90355660931.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b116136ad1---puxutonivolizige.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/81cdbf5dc7d3c371640c21624d2e9269/39651642626.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d49521e025---pemosuvesezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=asq+six+sigma+green+belt+body+of+knowledge+%28book%29PDF 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_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 11516 bytes
SHA-256: 553518f0fdc09b4054b5a43c1e382c480aebb3a1bd8d5103084094209f50e30b
font_02_sfnt_off00012d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3C 17492 bytes
SHA-256: a94600a3ecef0b390dd77721c7042cdc67d619f4f57cf4c993d41a36f44537c9

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