Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39f59e448de4ac5…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 03:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 387f0473b17d1874f43089461a2648d8 SHA-1: 8c409f341ed737b57d4d3a3c81fef09d72e23e07 SHA-256: f39f59e448de4ac546453c998850ecbefe0f191e83aa28b5f39b429b9ac3194e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

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://krisoc.ru/uplcv?utm_term=jvc+everio+camcorder+user+manual PDF link annotation
    • https://yodobashi-church.com/73120379539.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/a319c2854bf579e0edab5bcd9a6b47f9/rexoz.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/zelodokekolinijaba.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/woxizonezogavi.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/27442719388.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/ridoxigapanafu.pdfIn PDF document text
    • https://ptogel2.com/contents//files/42823205522.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/8cdddc679466cd2f52d55e8b25d186ee/7276648143.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/8a51c0ae764e78264d02dbb1efee9e50/bagodanidoxofutuxa.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb661cc4aa---pagulowadesewaliruri.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6047b7da5dcae8c05eef4a55d330f758/zuwuripetaxokovuwu.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/sozosi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16074c867e160d---fedate.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210720/file/16267169364136.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/053eec89cf251c1d11e94134dc379c23/6800267547.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-17/images/files/85165134020.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210608_124516.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/sapejirev.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/tefilejaf.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787d1d6e2f9---53538672891.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/71510f00da1e533d1613dcb55c7fcbe9/fekinowiwuw.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d221e5890---56467922188.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_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 17012 bytes
SHA-256: ff19b455ac3cab7ce7dc36a3a84310e8b5a0c9daac6186e10b3b7859049ac453
font_01_sfnt_off00010b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0B 10592 bytes
SHA-256: 4dc1b459f569f2b7cf5ca7fd34908abe49040afec699c87504c7c21d3f5703a2
font_02_sfnt_off00012335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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