Malicious PDF — malware analysis report

Static analysis result for SHA-256 615c4e9db848c474…

MALICIOUS

PDF

84.6 KB Created: 2021-08-22 03:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b653f2a132fbd5c058a70e2bd91230e0 SHA-1: 38f29bc9c8fc36fccabf2fa18a652d715633bea9 SHA-256: 615c4e9db848c4744406d7274ba600549e9336707285917ec72751606f467730
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous external links, many pointing to compromised WordPress sites or disposable hosting, strongly suggests a phishing or link-farming campaign. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://inwebjor.ru/uplcv?utm_term=how+to+control+tcl+smart+tv+with+iphone PDF link annotation
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/244d63fcs0rarb3fpndequ7aqk/50947577719.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/05480612d5fa48bf6c2a21c6b6bbec17/67448733011.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/758b03678ed0fbb2b52751af871aa401/8103737999.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/68247262424.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/didumubadejenajerezude.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/zosaxotenizo.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887b7a6913c---xilekarizigekej.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/42978617175.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1007201eb---rusubopexevi.pdfIn PDF document text
    • http://kleiberit.ru/files/file/90978993775.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f503ee10caa---68423795694.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/rubesepomarugeked.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c608020c8---20851809452.pdfIn PDF document text
    • http://bakoca.hu/files/file/zegojozefugefuvibaxitake.pdfIn PDF document text
    • http://sivam.pl/files/file/jawaduw.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/38272409152.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/70046099403.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/8e5a6ddd34fe25a9c2cedb021c580e3a/55293389744.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/1b938317afab511ecc3367c882ef375d/84927305098.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/75470958013.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/47086669079.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/19161649343.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/40303826538.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8554c51127---vofulobi.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/32770012525.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/6d3395a357bf772bb1067d8e639366c2/2653685875.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 16680 bytes
SHA-256: 9dc631300493dc5701eb94f4bfd703e3470ea8f01df3cef54819912e2b30e573
font_01_sfnt_off00011316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11316 10784 bytes
SHA-256: 234ec850e988d4bfa077d38f6ab965601a3f39ab9cacb94315ba89ec11b6ea7c
font_02_sfnt_off00012bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1