Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb90e1bcaf9efd9…

MALICIOUS

PDF

81.5 KB Created: 2021-08-15 18:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b6be63f725452e153d38949dcc961458 SHA-1: 048bea5fb5a464c3ecdf52eb3a6b3e2ff7fa071d SHA-256: 1eb90e1bcaf9efd90556f238c4975dd98acb31c738d876111fc9a9e55d77e3fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and link farms points towards the T1204.002 (Malicious Link) technique, and the nature of the file suggests it was likely delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=worship+songs+about+friendship PDF link annotation
    • http://huucodatlanh.com/userfiles/file/zugaladabezifore.pdfIn PDF document text
    • http://navigator-33.ru/media/file/83172704967.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/b9dab926bb71e1fad94f92351fcd2f6d/8946318464.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67ff887aea---tesusamurubawoleb.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/ruvalo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d607f2c615---xibowofezu.pdfIn PDF document text
    • https://educhina.mn/editor/files/77139633754.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/kutezemojoxu.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ikiv4lgkp13kuokvavbvpfcaou/67259202403.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/af22daba4433852af04019525aea7c17/dozezamirinope.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/momipaluziladigelapoje.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/raxelumudajenijamurusi.pdfIn PDF document text
    • http://sequoia59.com/clients/867919/File/73300728175.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/sinadugukuzewugefotedud.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/801c6b66acf9f9dd40093afbc4ab6d63/keriluk.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608011e144a46---xulunotuparidumasariziwaj.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9a0973da826f36704be6105d00ba4bfe/kipemam.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/46261865431.pdfIn PDF document text
    • http://rurisnet.org/images/file/pejorixakogifar.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/77393366487.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/padobepituduragitapajud.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16097c6781eeb7---1772305953.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9ED 10964 bytes
SHA-256: 9462c82272f9167e3b3d70646c7101faa37e623a70f98dd5a0af48613869c621
font_01_sfnt_off0000f2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B07 16824 bytes
SHA-256: eb799a5380aa8fb8aae68b3df525ee6a7765c75c601cc1e6c860d0f18f5f1e13