Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79d20f4c85b2fdc…

MALICIOUS

PDF

114.4 KB Created: 2021-09-03 22:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75d413dd2739b17537f00b00d6caccdc SHA-1: 003d96d443209f53fa7f4ab889ff2e0f99732d30 SHA-256: c79d20f4c85b2fdc3bcb888416dd8c57635818a0a0a45b59cfb9f0a0ef570891
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/069d178c6b7ea038b450c031b6653cdf/40733118117.pdf In PDF document text
    • https://getracemirates.com/userfiles/files/kemulike.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/ruviratisivajati.pdfIn PDF document text
    • http://yepuco.com/uploads/files/33645112617.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/31432940234.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/sezel.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/sopijoneletesojalidi.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c1dd12cfe---fumubowaropadasage.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/63350204335.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32a959c26---70387702685.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/tojalidovosaxizu.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6ed78cbd6---gawumevozimadigajinezor.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/vufoxadutomelimizemo.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/95bae042782c0c9d1ce8f3abf8d47ad8/kisetinakabe.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/1682143622.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb07f62b4fc---91412507920.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/kowevutufe.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/1f406dcd5f2f50268dd713abe5393ef8/66609462022.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/62813547906.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/69837970357.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/wimisovili.pdfIn PDF document text
    • http://tykhchem.com/upload/files/48226822986.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3670da005b---15139784239.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e92320b31c8---76427258418.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/85975519751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=psalms+the+prayer+book+of+the+bible+bonhoeffer+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_off0001572e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1572E 19388 bytes
SHA-256: 8b9db1a681f3ee2c9e0a9ebb5fad7b6be1c42b9ea7539879c67e6047555107b1
font_01_sfnt_off0001897c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1897C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A193 11112 bytes
SHA-256: 7de9e949c654ee1cd23b9b153dde8e7ddf769882b013005e61c1c93106a6142d