Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d062a483c5810a…

MALICIOUS

PDF

74.7 KB Created: 2021-09-04 23:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 349a60ee4d9cfedeb6c477ebec885644 SHA-1: 25227683b591b45a3a63b31ce33db318b67b4c63 SHA-256: c5d062a483c5810a35d9c336c814325a335fe8d1327397b10279ce63ce8a620d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute further malicious content. The embedded URLs and the heuristic findings indicate a phishing lure, likely attempting to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://baove24h.info/upload/files/poxabiforunokapem.pdf In PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/89460484237.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/46459566772.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc76c99a84---55793612541.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/47503341303.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/94619039823.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/ca37495b2b7687bee0d90e79a114b093/80592207787.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/91255116364.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/40189409127.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609820acadf5e---66515932050.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/f81d5f8a864dad579b1545f11f250b60/20672049405.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/bisowobera.pdfIn PDF document text
    • https://etimes.mn/uploads/files/radisofano.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/65287280776.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608273f8dcafd---82105871320.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/7ef58adc38e2b9ed1f8045e106c0f977/49638199465.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210630010001_hbrn8b.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/61084598155.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/28335591089.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/h2qmhrbp56i7p61rpltpumm2hs/renusevudazoruki.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/rirotugabadegesepupokaxu.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/f1mvt9fvms9hsqth149e78f6v2/vurusogiliremebakojoviluj.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/kugadunijazeredugogexali.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/17449305278.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/5f3d30c9f54a2c395939ec24d7cb287f/85432777372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=bb%26t+bank+statement+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_off0000c201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 9264 bytes
SHA-256: 4b949f70a8d45307359a064217e4b9c6531100794822d1d3ad528a53b6c70dfa
font_02_sfnt_off0000ed9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 18476 bytes
SHA-256: ab0b47f49ad2e4a22ba60158aa753a157710e6ba7868b43627334720cc75eb42

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