Malicious PDF — malware analysis report

Static analysis result for SHA-256 b574a356212c1293…

MALICIOUS

PDF

91.4 KB Created: 2021-08-10 02:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f68cde0dd4588aca1f2a927513a490f9 SHA-1: 73a433c04d18fbc9230dd30f1d6d1e7d4fcfe9b7 SHA-256: b574a356212c129388e28ab213e8c5fe873cb0a2c4b2c2bb63339e656b1fe73e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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=download+ngaji+surat+yasin+merdu+mp3 PDF link annotation
    • https://watfordfairtrade.org/app/webroot/img/files/23778646655.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160712cfba80c2---fekoloxasamokasivoz.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/3t1hse4t8kp91g90liha87186g/vedabejulofijulerovav.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16106042c6640c---vopakeze.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210503045619.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021070317013854.pdfIn PDF document text
    • http://sushibelovo.ru/files/78190162510.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d79f06b2c6c---87641129019.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/fekunodazuvamuxotujofed.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad77d0db235---kegawufor.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105aeeab58ea---mapavegisewekevoj.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1609cad2804104---zexivaba.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/wedarutinisu.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/pukubekonoj.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076166629c03---jobililapezifas.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/34269848906.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/80820419261.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea6be1765d---rofijasidijidewegewonevus.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202106155346_962090630.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/kidegolekivis.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3f975a641b---84072392246.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210730_154722.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 11336 bytes
SHA-256: ea69c1a827212754ec827f0f5c0e3e1642f296505f84e0c8071f0e650a356dd6
font_01_sfnt_off0000fdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC5 17100 bytes
SHA-256: e7c28460cc3e3c79290a997514386d9726c3e0b62a26c0f6d014ac248f8df1b2
font_02_sfnt_off00012a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2F 18140 bytes
SHA-256: 8415153d4036eb61348ea52439c2dc709e8c1d63e8bdb0a0434a69861f67d592
font_03_sfnt_off00014689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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