Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da963cb58204d66…

MALICIOUS

PDF

73.9 KB Created: 2021-08-18 01:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f2b41b7fc8f617b4b1ec4ee8fb559d8b SHA-1: de4acdd06e46f12faedae0d7ca0ea833c0a4d4ab SHA-256: 6da963cb58204d6680cb37ffcab1f8305b06ca503259dd21c8503f94b6e52c61
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ecohost.ru/pics/images/file/navifudamu.pdf In PDF document text
    • http://roocenter.ru/upload/file/jojubadenepazabuk.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/66536602710.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/wonovilodafiru.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/56929702745.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/5829490476.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607350065d7e5---10167158499.pdfIn PDF document text
    • http://zuche0551.com/upload/file/dezubokotejefotegap.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/ab3047a7d5f3164cb76611b3b6838a6d/50795233186.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/12895511631.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/giwaw.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6e77984fc---kidokixugalodi.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/xiziraromo.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/add1c6be7f9fc608cae4b64e00c61892/27901113.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/nuluros.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/refalifo.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7c3473a40872b357b27e4efbf6c95869/83996932527.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/39689007400.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/kodezaro.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9fd3ec5ea---8897710676.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/mipaxuwuzisikulokakudi.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/66961490145.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/65021757026.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/tawumapal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=roms+winkawaks+cps1+cps2PDF 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_off0000bf5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD772 10552 bytes
SHA-256: 11fb0db5a47afe22862ed64d44b62496fd8a07d6e54e603ce3f576bb15d59f05
font_02_sfnt_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 15700 bytes
SHA-256: dafe749049de07d5918b2251af9c2d0afa33e9b5ed2153260370fad2303d30b2

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