Malicious PDF — malware analysis report

Static analysis result for SHA-256 64204e48dabf1c95…

MALICIOUS

PDF

73.3 KB Created: 2021-09-17 01:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e4e96d62a73c7fd9fe1a51012d90902 SHA-1: bda36f672a6a191c54223e06511aa6f1bc5830a3 SHA-256: 64204e48dabf1c9532d1b28f0f6607699ee211198cbe947892c6fa19749ac7b9
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable or compromised domains. The document body is heavily obfuscated, preventing analysis of specific content, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://firsatpin.com/calisma2/files/uploads/gusunifemamelarosezeg.pdf In PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/cbce0ef014f3ba208e39a8f7cc4d96cb/vowozo.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/tolik.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/f3mn201m81k281c45i8qhanrld/misamej.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/8948aa53eb04817d87746ebfbab9d95e/xibeletawerexisiragibok.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/12110518534.pdfIn PDF document text
    • https://aspirans.com/files/file/rotajerofiginekonogajise.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/85668153417.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/kelujopawo.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16143bb4a9b85f---jefafalutanutuz.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/mimaronatajuviz.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/43440025656.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/95817567285.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/zarusugelowibe.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/63938363640.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/mozotajupejez.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202108311725568401.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/vumowazigaxaza.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/61733642816.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/83060182287.pdfIn PDF document text
    • https://costarica4d.com/contents/files/80579354859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=plant+versus+zombie+2+apkPDF 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_off0000bdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD9 15888 bytes
SHA-256: d7445e6555f8db08c120e71e1161ca1d5daa80e2ce3a6472af703a524cc37f5a
font_01_sfnt_off0000e601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE601 10992 bytes
SHA-256: a6d11c2c0a1927d2e28020f22d82340b01d35c12a59d851b8da563d0c33d4d5c
font_02_sfnt_off0000ff70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1