Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2f28d0661ebb26…

MALICIOUS

PDF

79.3 KB Created: 2021-09-23 01:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e8e52e3f94884b80231a0fb5260c2c2 SHA-1: e1ec8d180a4850858b5e1193638ae5841cea6299 SHA-256: 9a2f28d0661ebb2632171a0136d2f18193911a7045d17dca85eb96fdfad4a3cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and numerous external links, many hosted on compromised CMS uploads, strongly indicates a malicious intent. The ClamAV detection and ML classifier further support this, pointing towards a phishing or redirection scheme designed to lead users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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 https://infrive.ru/uplcv?utm_term=transfer+sim+card+from+iphone+to+android
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/0e9386d14576a315ce57868ed7ade59a/98783483387.pdf
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/33789189528.pdf
    • https://media-get.ru/userfiles/files/24016315716.pdf
    • http://pzhjintai.com/upload/files/xafolovevu.pdf
    • http://ohana1bbq.com/uploads/files/66354397655.pdf
    • http://tuzvedo.hu/elemek/file/sosurija.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3980b266---63886700722.pdf
    • http://jshtextile.com/UserFiles/file///dazew.pdf
    • http://k12kos.com/ckfinder/userfiles/files/94218280610.pdf
    • http://asclyziarskyklub.sk/userfiles/file/nusefut.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146340fef867---36366516510.pdf
    • http://popmetre.com/news/files/muzejuxekafukele.pdf
    • http://snap-drone.com/userfiles/file/toxezaxuxanoruno.pdf
    • http://kxqcgs.com/filespath/files/20210919153533.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/dbf4266187010bd6a60635f3acf7c921/32038631798.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613227a8d4432---nefapiwexeboti.pdf
    • https://forumhrdbekasi.com/webroot/userfiles/files/67625790468.pdf
    • http://sm300159.agchost.com/userfiles/files/51462061595.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/21410917381.pdf
    • http://sweet-sugar.de/images/uploadedimages/file/gijipum.pdf
    • http://www.santamyoga.be/images/file/mutafuvolokafatopiruxed.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/45130232514.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_off0000d1ba.bin
0c01c7e37fbde454751363fd4d952bd43620a9fa0cf90ec2a7c02be4ed8bc2ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BA 17392 bytes
font_01_sfnt_off0000ff2e.bin
86a9871f0edf138b143d8e48e1100282138e99644f3d24decc3802e7b44054a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 10800 bytes
font_02_sfnt_off000117dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117DD 16792 bytes