Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2736b9a608997eb…

MALICIOUS

PDF

95.9 KB Created: 2021-06-30 01:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99096b7e4fafd55e337f3db43f946607 SHA-1: 3f42c61e6f0abd9ab4ea9981a06527a3d0f89acb SHA-256: e2736b9a608997eb81456f2001f8ccb1b03cb97d559a9acee4bfbef7bba4c3fb
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a ML classifier and ClamAV, detecting it as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the heuristic firings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://agroanaliz.by/upload/editor/files/28739970175.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a30ab495cf8---tuzavetabegepifutoroxorel.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4912ca7a3139c218b261e37e63ac9a0a/natuboniwixisufeli.pdf
    • http://www.anjhimayath.com/upload/file/wegidut.pdf
    • http://envigest.cz/upload/file/zujasodovomem.pdf
    • http://softwarefactory.nl/images/file/jodixanebuwiguvuriliz.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5b305f7f7---4598776025.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753b3cba150---92592124382.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092965e195c4---sibexekirizubinejurelopog.pdf
    • https://thietbidiensino.vn/media/ftp/file/lijisepokoj.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e662afdb4a716a919c1da351a3a6e87c/81662901024.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef5c237b89---70167877328.pdf
    • https://demircanticaret.com/userfiles/file/jakijulamopugupas.pdf
    • http://faxik.ru/ckfinder/userfiles/files/94858132916.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41ab35ba5---torabumujibazanezabinad.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/2bd11e5b00db5be40fa3798a124e42d9/lajujefutiruxagu.pdf
    • http://debeleven.net/UserFiles/File/bujuwupevozofudiposipise.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/uo52709s06pupthnql39l0gka3/nakexadi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cc90cbd8c---wuwawemodavekuro.pdf
    • https://machinex-machines.com/UserFiles/File/vafel.pdf
    • http://myucmas.com/userfiles/file/togutiki.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4616aa739e---savobujasogixolezuf.pdf
    • http://tivatijapan.com/uploads/userfiles/file/dumir.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=skill+of+stimulus+variation+in+micro+teaching
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/de12e05c96ee7f2f67e21a7608d9aa53/23537422262.pdf
    • 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_off000112e4.bin
bf8ace8c314feab1c221727a688acdb12d84b3c6369e0ed6952b6bccd16de456
pdf-font-stream PDF embedded font (sfnt) at offset 0x112E4 16712 bytes
font_01_sfnt_off00013e21.bin
525e4f4382799be686f67adb00345a27bcac440431484fc2b47b8673cb28c543
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E21 11116 bytes
font_02_sfnt_off000157ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x157ED 16792 bytes