Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6c37429df9f2a8…

MALICIOUS

PDF

94.0 KB Created: 2021-06-26 10:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a03ca7c4e4606a8fcfa66765add0523 SHA-1: 16758dffd893cc11c330c88e15dddc05b64181b3 SHA-256: 1a6c37429df9f2a8fadcc8078ab73cdf2cb46e37734ebd66797a8a10740bd2d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites hosted on potentially compromised or disposable domains. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://ketchas.ru/uplcv?utm_term=film+only+you+sub+indo
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f492e254---gimotusesuzigakedikit.pdf
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/xulimijekaku.pdf
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/majazapowifuri.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/eb1931f6a2583d4125da89f420890cb1/deroxasevesafo.pdf
    • https://mmagame.com/userfiles/file/vazana.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/fa5e058127f017fec50f69c996f6ab55/zofezuluta.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160986818461ca---jiretekowobetakozetotab.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a416c6e7783---47899093331.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ff56712b---wonojuratubito.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17a41b32b---mikekafujezarojixovil.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/72409f568ccb5ac12f2f26bfa32a6ff6/borazesopa.pdf
    • http://sushi-belovo.ru/files/sutumoruwonumajuvubaf.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/shoa4ie31mcqrksoslk6blo6u1/lekov.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a746ba7830fb611790ab0bb402821b91/22562740577.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/70ca336c1a296ee20e111eb08d6a1cc0/94182154931.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab20d638cb1---didal.pdf
    • http://blessingsngo.in/userfiles/files/nakejukozov.pdf
    • https://ski-experience-japan.com/images/blog//file/bugodutib.pdf
    • http://sys-svinding.dk/userfiles/file/fabebokusutalebojizamiluj.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/117d2cf11cc74782fd02e08a42959a39/safusajeninoxotuneru.pdf
    • http://indago-rovigo.it/userfiles/files/lalomevomux.pdf
    • https://dhesient.com/media/16364383344.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef6c.bin
a70ae9ec81e2d91c29eb84dbe3ecb374b2fc7cd61a26b6a2b2884e4f4bf627bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 10248 bytes
font_01_sfnt_off0001064e.bin
ecb81363564929c95e17448b7e5a9d41aa0cdf8937434d11e9e276d04c15834c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 18044 bytes
font_02_sfnt_off00013556.bin
c0e3145fadd258ed47aaf54cbf45d092e17ce6ee0de5d8f1cf17072fe4a21b31
pdf-font-stream PDF embedded font (sfnt) at offset 0x13556 8812 bytes
font_03_sfnt_off0001524f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1524F 16792 bytes