Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c7aaaaca967d71…

MALICIOUS

PDF

73.8 KB Created: 2021-09-08 23:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1bcb86dba49854303162eb780afa4df SHA-1: 958fae0dbd35f07ce7a5c7880c9ad761a670e333 SHA-256: a1c7aaaaca967d71e01d9c61923c9d1a92784a29f1601a2dfeb1304687402212
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 link farms on compromised WordPress sites and disposable hosting. These links are designed to trick users into downloading further malicious content, likely a phishing lure or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=download+raft+survival+apk
    • https://tort-art.ru/userfiles/file/xobajixowizidisux.pdf
    • http://dalieuht.com/app/webroot/uploads/files/mabuxomewadamif.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/af5dc8d05bdfc0ebca153b2221e6838d/74978909909.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/munafunuwu.pdf
    • http://appextskihjthj.handysociality.com/upload/files/8782552341.pdf
    • http://fpempresa.cen.es/userfiles/files/volotuketiwib.pdf
    • http://industrialdevices.in/uploads/68377801195.pdf
    • http://potlista.com/file/files/bofewago.pdf
    • https://ahl2005.com/ckfinder/userfiles/files/18637249701.pdf
    • http://scsychem.com/upload/files/fotukitote.pdf
    • http://studiolauramoschini.it/userfiles/files/vamuxazubikivujupa.pdf
    • http://machinesupplier.cn/data/product/file/202196_123935_646.pdf
    • http://savemaxint.com/files/file/tebonuwulis.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/hvec41hor16bbrgu9m1kaj6pb5/jerolifosinoses.pdf
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/39094865294.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3732f271053195d1d6dca1ad4f618e11/47221735617.pdf
    • http://www.mariabeckmann.com/fotos/uploads/files/78741658938.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/49781060182.pdf
    • https://hsdinstruments.nl/uploads/files/getojawebomapetupad.pdf
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zejesulodebabawipetawalu.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/14939390306.pdf
    • https://techlan.pl/files/file/50244180216.pdf
    • https://rosenstein.lu/userfiles/files/vivilusuwosusixobak.pdf
    • http://archi-m.ru/userfiles/file/lokigujojuwideguzof.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_off0000bb8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8A 16792 bytes
font_01_sfnt_off0000d39c.bin
9eabed119124feb26fa3269f1c702cacc545c1d2a79122433adb8bf7b30397a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD39C 17480 bytes
font_02_sfnt_off000100e3.bin
1a9d421359b405ee168a841e676aa3e27058b8711fa3bc31b572edee8d4816b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 10704 bytes