Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c49dc6dbd833e7b…

MALICIOUS

PDF

86.2 KB Created: 2021-07-21 14:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8df59dc09a93560dde222edf8afa7745 SHA-1: 26cd6faffad5848fcf6ee4fd5e9135386acb1267 SHA-256: 0c49dc6dbd833e7b821ed2b40b0651abf8bfcd605d7dd5ce7b80c8503f9ea5d7
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inphuduong.vn/upload/files/xudotuzivopavovobo.pdf
    • https://pacie.vn/web/uploads/files/62569256872.pdf
    • https://wagaskar.com/media/datowezimugixek.pdf
    • http://stalmost.pl/userfiles/file/ranefuvinet.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b24f8a416c5c31f69478b737f6b9694a/giwimesewinipaviliton.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/81fdabb2a67a7d722df06be3d481be9d/xojavegak.pdf
    • https://moto-trend.cz/public/files/fck/file/tezojowunaginiluse.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c18a33ab00---xoxewidezitoxux.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/eacbc95a9efe1854242489fefb91a0fa/fiseno.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e23ac3d68---dirisibilas.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/7mp699bn2924idroc73p1d5864/wajata.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609665e11ffdc---xizinigifewutewagukubave.pdf
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/81020465100.pdf
    • http://malbreil.com/userfiles/file/43987084855.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/b9ec7hkgdqiv4hnoldecgiv91e/96674674795.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988dcfa8254---suruzeporonurujagi.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/429a793d0fe65670f7bd598f91fb4d17/50408369581.pdf
    • http://funperm.ru/content/file/64080221661.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607965b373207---9312087517.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20b031c06.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869806152f8---gelagenawikegoxupaxo.pdf
    • https://cengilli.com/icerik_images/file/pazunukivinefugipe.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/28b6c4ed3d5fe728b4c88cbf7401a44b/dejamakenoturu.pdf
    • http://rld-carbon.ru/file/37168673159.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bollywood+naa+songs+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f00f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 16792 bytes
font_01_sfnt_off00010826.bin
447d8bcd2f913fa0470907600da0b71a1a7a7dd743d47dc49938ddd123a2facb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 10256 bytes
font_02_sfnt_off00011f2a.bin
2b3360249c06659ce2b3cc37122e3fa5ceacecf6ce67b05ab0da2e530eb2767a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2A 16808 bytes