Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45a7d3b0a5799ef…

MALICIOUS

PDF

85.5 KB Created: 2021-06-25 14:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b69ba4dc7e933e4976a174c8c684e491 SHA-1: 69d3cc463a48899ad4bda75da925dd81f59d1f90 SHA-256: a45a7d3b0a5799efbd74519ef1612156143f7074ddf85f28512c496547be8d6c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable domains. The presence of numerous embedded URLs, many pointing to WordPress upload directories, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://yilip.net/userData/board/file/nagibasube.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b2a846f68dfb728e2ecf0cf19f7c6723/malumusazozexebivo.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/f0b06f81e15d2bd6aebf2ef5ee2ba3ce/julukazujipetom.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/2c3716fce657054535b42681aa004aee/pemonevobipowi.pdf
    • https://netpage.info/userfiles/file/tozetorasaforazuliseku.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c416dde788---41062510909.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609814c041f52---57046457014.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/ebb224ceb5a0245abba2e29efa0710d3/3899470137.pdf
    • http://turagent007.ru/userfiles/file/kowipidizowekirotovaduk.pdf
    • http://colafranceschi.it/userfiles/files/20193538964.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7cecf382e---23823156583.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fec2b471a9---rizes.pdf
    • http://detikakdeti.ru/img/file/78391647449.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10536e56c---95479043547.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f23c36b696547611bb4f9ff61a1836ab/25314130032.pdf
    • http://provia-events.de/pics/fotos/1/file/ruferajalixu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=physical+signs+of+leukemia
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 16792 bytes
font_01_sfnt_off0001071d.bin
d58b9fab4185fdcc93bfc88d086bc1dbe69dcac989d1bc6d49f014e1cda5ec2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 10892 bytes
font_02_sfnt_off0001202e.bin
bd10898cfae3bbdf7bef369f4f605f01cfe4dbe3b656e67e510bff0705f7dbf2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1202E 16012 bytes