Malicious PDF — malware analysis report

Static analysis result for SHA-256 506bda9f2e768945…

MALICIOUS

PDF

79.8 KB Created: 2021-06-26 08:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0008d1a69e8f20036c24c0da87df6a57 SHA-1: 0143f306ebab56152f9d12c3cfe1da3339788baf SHA-256: 506bda9f2e76894551cac586aefae906d3e783edf9e0810126f02032efb20de6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/9mdib24jeh7ijacjsqgn37jfv4/80036390243.pdf
    • https://fundreamz.com/ckfinder/userfiles/files/88394132295.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/tewoxofudabutilik.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6fcc5ac4e---57695736884.pdf
    • http://dentherapia.hu/files/file/towukenabozejatenad.pdf
    • https://i3mit.com/shopadmin/upload/files/vibixuvep.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/r6v6vb2vklteqka4djov92pm56/rababoragusemapapatosuxa.pdf
    • https://vegas-shop.net/uploads/files/xipuj.pdf
    • http://musclecar-taps.com/js/upload/files/32291795674.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724a3d7738d---75226917870.pdf
    • http://budohurtsa.pl/userfiles/file/97438801655.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e4d5be380---molofasobonekole.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ba308321f9444c7d8c1c0f3e2472cee9/67270613055.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c87b85fd507b2b029c61da6d0ea74f9b/tavapove.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afca783cf83---2739934578.pdf
    • http://bearings-home.com/userfiles/file/2531688826.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/ab929264a6dfe2832a83554e675fd0f5/vatalifujifomod.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735a93300d5---saxifosawaguj.pdf
    • https://healthmatters.me/userfiles/file/72697885028.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa4a818cb---vetiwokuxuze.pdf
    • http://bwc.lt/i/89758002768.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d5c6da60e56564bf88f834d1899b48d6/gujodaliz.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7154a31328---tijokofudidagopo.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/1020edd46c1915c51bde1466a31d9370/34378662892.pdf
    • http://qkmedica.com/uploads/userfiles/file/bapokololilaxiveluvebopej.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=good+hairstyle+for+men
    • 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_off0000d66a.bin
0bff6db7d40a0851e88d982de0eb81cb40e8a1529ec2fd5fa1472c3f8c19b2ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xD66A 16644 bytes
font_01_sfnt_off00010186.bin
bbab2c2d47cab8b93049b72cc6201c4a0c721b4e227b9eb4a0ffbc1094cfaafc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10186 10772 bytes
font_02_sfnt_off00011a32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A32 16792 bytes