Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e7ee11a8598d5a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 11:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad959d983adf1bd029fd9706cbfef2e7 SHA-1: bff144bf346558569684b2c7b088bbafe4768936 SHA-256: c9e7ee11a8598d5a456d814b4419a946875bbbd9e62c135f5980a7e0d62807b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm and potentially malicious content, with a high ML score and ClamAV detection. The embedded URLs point to various websites, some of which appear to be compromised CMS installations, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/e98060d26acef3a127c5a9f34e7e4fb6/99966251758.pdf In PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/vofuzawarususajaxe.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/59234927021.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109070607242915.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135be4db4631---63708143690.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/54966745217.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/nonemalano.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/vamemabogerin.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/xamutukagetodid.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/87660305856.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/mopivoxiwozovad.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e63b100ea---53513630059.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/76729027260.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/p42jm0j1i6913fecmagpbhf8g2/61800299950.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/pufigero.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/mexagupigamodobe.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/75465628174.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/90650215406.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/puruxadejusepewox.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/katevavegazenenefem.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/dekukaribamusi.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/31582307849.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/79eaa4432f0588291d35b396c8a34dac/6532735303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=spear+stickman+frivPDF 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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 16928 bytes
SHA-256: ca065634f1e60fb4e43e2db14fb6b2ffc110cfdc201c48844018c1c3481c5f8a
font_01_sfnt_off00010746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 10708 bytes
SHA-256: c0e1b0784720b05a526fe20bbb95a686c927aeb4adaf8d33b9bc52fca37e01f6
font_02_sfnt_off00011fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1