Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a174157730cd91…

MALICIOUS

PDF

87.0 KB Created: 2021-09-19 07:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 788f70fd15b8d757209cd29ef91fa59c SHA-1: 436ead582643ed465aa880ea9da9bd7ae16ab345 SHA-256: e6a174157730cd91dbe965e12404eca764bf698bd8fd7b79a3034519110e3455
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of encrypting payloads to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://habibitours.org/ckfinder/userfiles/files/37886771373.pdf In PDF document text
    • http://nikkenj.com/userfiles/file/37969794123.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161425ec6a8274---7775280505.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/sajowinapexikuderamu.pdfIn PDF document text
    • http://topas.lt/userfiles/file/faxeg.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/11397784669.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7c493c744387ffbedf4c63846d451856/98521845646.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/24995288115.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161327f435a810---pivetowovelixapilapipum.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/80679515436.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/97653389930.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/movadubiwofuzu.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/48611960965.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vudowofaligojepomi.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f312b4ec2---9458481236.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/24481178813.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/lobefos.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/dijasugafoja.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/sepev.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/98983974814.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210908195317.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9ef5182ec8581caeda26c09c7f351a0f/3497326639.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/gebeza.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/wezisaw.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tuxadagok.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/94567318061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=shadow+fight+3+offline+mod+highly+compressedPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 11516 bytes
SHA-256: 77844421268a2567f4a3fd230f7b50e738e6120b6ed64b4fd745fc7085385e43
font_01_sfnt_off000106ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECC 18152 bytes
SHA-256: 94315dc4dda8fbe72516173e09793ef48081d72a4888c8845550ecbe359e5a5b