Malicious PDF — malware analysis report

Static analysis result for SHA-256 c857ae593a5a9829…

MALICIOUS

PDF

78.2 KB Created: 2021-09-01 21:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 40623d5f9db649f0a8b0666ebcaa8425 SHA-1: 4fe517b65c2ba41f20cb4ae93243e8e592b7ed44 SHA-256: c857ae593a5a9829a8eded68767281d590a8b0f2adb38f30f739cc4851f1c1b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://phongthuydotho.vn/upload/files/47655997906.pdf In PDF document text
    • http://sushibelovo.ru/files/vipuwibewe.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///62730765989.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/zafaximebo.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/xapesanov.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ddaf2b364---2049893415.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9c781046162eff87b3abac82c2a3a10c/83814915152.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/66375484524.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/moxanibawiw.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e188ae3c66---gupuzu.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/8d56060f4041e2040830ce63c9d93692/dasax.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b62ef13b9f---wifotefupezakejobu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160765e7c9b88f---firixipet.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4875fae579---vekinujafelugi.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/6835294949.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/lunanukaxuvegom.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/55946534895.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/gh2cr4ic1pk0fl38anegpcntkt/somises.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/35288936327.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/e9js49h05s0cst9ui7iltqv9uk/purarono.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/29552495131.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/9be1226b34ff3ef76606dc09f19cbb5a/70341607057.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/5019903293.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/bibixikuguka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=tom+and+jerry+touche+puss+catPDF 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_off0000c18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18C 10948 bytes
SHA-256: 83cdb1373ddf82b58e6c65f99bca23e65f014537bd0a256947b6362916a30282
font_01_sfnt_off0000dad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 21032 bytes
SHA-256: 731fc0122522c4c2544ba5ac82e16de0ce584b33a615f8b8c2ebf1d123690290

Open this report in the interactive analyzer, or submit your own file for analysis.