Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59ec9f5ee113ee3…

MALICIOUS

PDF

85.6 KB Created: 2021-08-15 00:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a31eb492499a9b7c47aefb5a0af1318c SHA-1: 6915398e92194bf8ea43ca9586aa70fe379e71aa SHA-256: b59ec9f5ee113ee3c11aa0fcd7b53c84a67aa9a534bcc7ffb19499b02eaeac67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=feeling+is+the+secret+neville+goddard
    • http://elateridae.com/images/FCKeditor/file/87608453516.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/367d7c90ac45199f226ea10ed5906b62/92336675514.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/bhtqntjk3sfpca9nd8ufv0mh3j/sowatuganano.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112252cb66d4---18565669188.pdf
    • http://emeraldcovepartners.com/_data/images/file/burokafu.pdf
    • http://aaykpn.com/uploads/editor/files/kulupesomelixa.pdf
    • https://safrano.pl/userfiles/file/86440850448.pdf
    • https://tyeetomsfishing.com/userfiles/file/jozudimuforavasezujerife.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/h8aa3uq6nq6e62tntven9o9otq/99231276389.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a364409ad---jefotetufosub.pdf
    • http://agriturismoilnoceto.com/userfiles/files/2077079847.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/64624327.pdf
    • http://caramelitos.sk/files/fasapekugifuj.pdf
    • http://verynailscm.com/user_img/file/70096424862.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/bdfa6fab39c66e7a2332cf39ac5e9c99/fepin.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9187a7e912---43121173284.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a864f1a87e6---nifojupa.pdf
    • http://www.sport-konyv.hu/userfiles/file/wubidigatimukude.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/728de1ed54bab02128cc6d88c3da7a4d/21929628887.pdf
    • http://prime-standard.com/piceditor/file/95596926861.pdf
    • https://clumba-indoor.ru/files/files/15981943846.pdf
    • https://manuscripthandler.com/userfiles/file/2547087372.pdf
    • http://frutapacargentina.com/ckfinder/userfiles/files/ponogapenedifesovabufu.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082246cda888---58825834537.pdf
    • http://www.39koratmachinery.com/file_upload/files/47231484504.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_off0000e9f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 16792 bytes
font_01_sfnt_off00010207.bin
7122fc75637680fbbf5fc87d61404fe58f4017400206816dbb1bb5af2a3f795c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 10692 bytes
font_02_sfnt_off00011a46.bin
903409c6d6fd069ce63f78d88eddba58f18e88d0ae4bfbb1ad38890b0fddddef
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A46 17724 bytes