Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d85018a6829ffe…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 14:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0871dc901fa9127afbdd707be7b7b3f9 SHA-1: df62f3e5374c007cac9d38e405a9d5cf556fd258 SHA-256: a5d85018a6829ffe4ce8379b3d6831cdbeac94f17d002c61181e55abdf9b3586
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, indicating a phishing or trojan threat. Heuristics identified it as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://clinivetmadonnadirosa.eu/userfiles/files/jupokirikor.pdf In PDF document text
    • https://istanajpdua.com/contents//files/pores.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7351193671.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/mifugigufimuvesa.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/52107752562.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c1ae6baa3---74047439232.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/1025655889.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/b06fe00fbb63b68c5bd9149e9a9023c8/92701854061.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/48068465795.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/pikeroruzegavomizedosis.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abf41e0a305---wifuvubobesolajinar.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/neken.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/10730486712.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/46ab809891f8c3ddc013b31ba7dedc4f/zajetosekugufaxanubuzep.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/5mc8v17eassvi6lfrbpgerl4c5/kelizozojuviparutazovuzo.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/38525689367.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8ea807aaf11ea56e52b1c8fe569c213d/kujerasoropoxuwafinupati.pdfIn PDF document text
    • http://vswet.ru/f/satabajigamitejinoti.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/pugikijatike.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nimuvetuge.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/64790918823.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075f522a9b1b---tatojawamozutiwabivutenid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=present+tense+pdf+testPDF 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_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 10072 bytes
SHA-256: e496bc09a324c0badb963d3d2f4591178e9c5ebe6fcce588b070c7c72a22997b
font_02_sfnt_off00010e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E12 18724 bytes
SHA-256: 74fd6a2ea91c5181f6eb5969f791b476ecf7d2eae04ce7a6c3324854d285de66

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