Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fe6bd2a24497a4…

MALICIOUS

PDF

82.4 KB Created: 2021-08-18 13:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41e3b49390c6a8a683fd56d7e10647f5 SHA-1: 3619d4388786a44284a570f0e0e0e021949adbf6 SHA-256: 24fe6bd2a24497a407de15285182091a83c5afb264d741bb9d1949856ecf60e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites 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.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://voxel-avocats.fr/uploads/file/busopagoruduwonigit.pdf
    • http://edilgroupdigiovanni.it/userfiles/files/loriro.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca6e564940---96136837692.pdf
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/luzuzofivikineso.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/6hjc4neadn2mm6tmbnb5pjka41/4913377950.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/31326551971.pdf
    • https://eubeer.vn/uploads/files/sewidimenividaw.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/800fb6369de53c5c2c2b1982db4ec588/nogudebonepaviveg.pdf
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/21775433569.pdf
    • http://metallpress.ru/files/17548490282.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/uhvv8rhpf6tptb0fiqjkkobba4/31353760268.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/34643658239.pdf
    • https://chachachat.info/js/ckfinder/userfiles/files/jatexivumuborapunamevitek.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/43494087116.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/3221c5545524a1bff16a0f34708be3bc/zuxuxivom.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b4650b39---69755109488.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/5tetk4g0asnvo4ifbul2ve3ed1/80608438461.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/24a98e0472e34104ef1406f42edafd56/mugam.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f590f6983c---kuxipemiwowixilew.pdf
    • http://1night2day.com/UserFiles/file/98223897140.pdf
    • https://accuratesearch.com/userfiles/file/71703121655.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/mksujm56a1j4cvs81cnepn05f4/nazoj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pagare+formato+para+imprimir+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_off0000da32.bin
883c5e8f21986d34bec0d4804937599db7607489ea54155401dc5f1088b8a279
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA32 10524 bytes
font_01_sfnt_off0000f1fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FD 16792 bytes
font_02_sfnt_off00010a0f.bin
1f1e8c8d22a28c2b4f28ace618ebeef3565ab396067a1af3283843d9d8424ed5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 18940 bytes