Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4b3b87418f6030…

MALICIOUS

PDF

87.3 KB Created: 2021-07-03 14:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 00c15015aeb23d46b53260d0f1be874d SHA-1: 0e2fe5fde64bff4b021e3a7bdaea954e015f0dd6 SHA-256: 0f4b3b87418f6030b17d538d2222b821030f0448ba303ce66143a0de3a26e521
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm with numerous URLs pointing to compromised WordPress installations and disposable hosting, suggesting an attempt to distribute phishing content or redirect to malware. No scripts were extracted from this sample, but the presence of multiple suspicious links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26efc00e77---natekubuxapadanudijira.pdf In PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6c8c4b3b---21702270902.pdfIn PDF document text
    • http://fitviewer.de/files/file/13120465331.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/htmada6vvj2821a328fqm1efmr/76925077245.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc30536730c---89777557651.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/sedoxopegufenafapugo.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/7424735904.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/bafiwuxiwegodutag.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/judodage.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0d76effca---bofun.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/68bb5bda50026598759f85061c1cfa1a/98092680525.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/3c3c1c02a89bbc824b0ef9bcdbf5f8df/razemobofodetapikap.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/tiwolivip.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e47a1f359---71714134527.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/nubuj.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f5aa8b156386fc85db9edb8096ad147/kuxeweboxikigaxun.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/72901164904.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/60926961025.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/53877098700.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/6b3qhj654e4ni1vbsk1smrm5c1/voxokopetawugazozizove.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/femotepivipodo.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/im93qm20gkqhdp9kbb6034m0aj/sapedimurabimokekejiji.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/63402908405.pdfIn PDF document text
    • http://ddmlife.com/ckupload/files/46395525091.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/siwuwapanosup.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaa5f9d7ed---70138085675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+much+caffeine+does+milk+chocolate+havePDF 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_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 10976 bytes
SHA-256: 156edc4f6bfad5bb93e6e444e5cc63d530539d2a4c7e3a2e93274e5e943bf4f5
font_01_sfnt_off00010751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F63 17696 bytes
SHA-256: ac3f6e8dc76f413f989268d8bbd0d281436f393de6dc3419548159e70f8b6cd2