Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7ad427d3353f29…

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 13:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 009e6db2eb1f378843c56ccbcbb44224 SHA-1: 729db8fb3e453408fd2c1542c1d40844067d84b4 SHA-256: 8a7ad427d3353f29ac4bf29c8c0be55447f8de937ecb670a9ebc46ddba8d0cee
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links as a link farm on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://precedent.by/_newsite/images_from_html_editor/file/16590610815.pdf In PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7044bee7f---86610018152.pdfIn PDF document text
    • http://renovator.cz/files/file/xazimumigude.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/mogosomajipodexigobafuluz.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0411dbdb26---58975607370.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/920e3bb2b7fee948963c0f30f772f067/vukatevuvogupekar.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7f5e16cdb---fedidojaramulominipav.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/4c693da214f4a3c49dcc63c171b1eeb0/lanizarokedovuvemejewow.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/92262669e9ff8597ff0efca1695b9e12/dobunane.pdfIn PDF document text
    • http://capableapp.com/uploads/files/xowunes.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/6u5l7l2jgufd6i5ljp95m720eo/biwefowelabowebaka.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092efe5227a8---25936907801.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/5df1130a8f97be37aa71a0c69c42ce43/ximosudugulomajuzemepufip.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/fopetoxivupopokomuligivu.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/82639738985.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086724f37797---65093593408.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/31420647881.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/tevoruje.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160940cb72d657---67955333800.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/72820874256.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/18328111092.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/kamojaz.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/18d5b4e9c2870e7c67f82802a7aff4aa/44273176560.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/29443676718.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///38588455640.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/tisifapejapuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=charan+das+chor+play+pdfPDF 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_off0000c0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B5 10540 bytes
SHA-256: 2ce41e8e25cbc0d40e1bb89933a7af081904ce38c075a043b7a1c3ceb43efa40
font_01_sfnt_off0000d8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AB 17340 bytes
SHA-256: 0954d398ab9a7119b7da6f88d705b97acbf9012eaee1ae33f66d26fa95af175e
font_02_sfnt_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1