Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d61ee6796d43be6…

MALICIOUS

PDF

100.3 KB Created: 2021-06-29 14:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 57d2ab0dce49beca5ca0cc934558c373 SHA-1: f46b0b98d267a178cfaaa0e281441205aabfb209 SHA-256: 2d61ee6796d43be69fc4000075afd0c5c6e7bf0e673e8a253d8df08eb8c1b662
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true malicious destination through link farms and compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://synerhu.ru/uplcv?utm_term=kinetic+and+potential+energy+answer+key PDF link annotation
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609822b5cc0d4---19054942821.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/wafet.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/matamarubexowavibe.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/46006252236.pdfIn PDF document text
    • http://hrudolf.com/userfiles/relusel.pdfIn PDF document text
    • https://anfauglir.com/images/file/tikojotirezin.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b99a5058b7f---17265689323.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/30a84ffd1dae1eb5db9665f592de8038/28453135844.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160862404cba36---magelisumodokavoluxa.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/6c58d0e8b5d0f5cfc25ed4a4a6742d46/fujagewipisew.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d2db01f2d---42962514691.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/bc2bf5b51af9fd588f3de9399cafe622/73934179838.pdfIn PDF document text
    • http://bjallstar.com/upload/file/49404196828.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/88l13nht6euov36mniaaiuhk74/22716873320.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/26885768014.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/gafinajizituk.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d2cd7de6fdb9ef08de003226d82c2f5f/72681786110.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e37308834---vabix.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b44b35661---rupojowexopesabopemov.pdfIn PDF document text
    • https://emprenderem.cl/files/78939358880.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/jedoxikunumagabigesig.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/karurunifavikisutom.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/n6acl2otut3v7q830a8dh8a61r/94659051064.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-6/file/2021060104175473499.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3f1ef6a1838d46a3463aac9176d6d4b6/lusobomizexusuliw.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_off00012123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13935 18356 bytes
SHA-256: 89edbfffc1bb1d57d6a8f0281aa54e834cfc5b6ac2d19fc6c4b46c760c1a3e4a
font_02_sfnt_off00016a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A6C 10972 bytes
SHA-256: 595898caa1d972b49e2e80d62a9a65bca668c0075512e39c193ffac511c291f8

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