Malicious PDF — malware analysis report

Static analysis result for SHA-256 372eb8e1365e2c88…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 08:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9115fb3c1779486c6e0fac8ae9732b3e SHA-1: decd0dbf47cd8d233e4547abed356edce2082bb1 SHA-256: 372eb8e1365e2c8884fcddd2f015d5404f968eabe85516adcaa99735871285c1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://bike-accessories.supersites.gr/content/ckfinder/files/zanufas.pdf In PDF document text
    • http://ambulanceservice.pl/userfiles/file/depofefoxenet.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/14511355287.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/pajimofedizivebezigoxo.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/no8k98p8fvoaarmr6j0opvhfl9/78782750588.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/xokogizafifudonexinaga.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/43733370017.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/20972011677.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16139be04c73a9---72819286091.pdfIn PDF document text
    • https://campermagazine.tv/public/file/45459332662.pdfIn PDF document text
    • https://kapefashion.com/files/files/dikaba.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/9562815998.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/67875474936.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/wexudiluju.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/penazikuduguberobaxijo.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/77263901620.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/gnqab0t27vosfgt7n4m4lvr214/natuzediguvotetotarifiraf.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/83002109936.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/18765451205.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/luvoreretagewa.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/togevuxepawamufog.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/tukowa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d69ab14b73---bosowevelegapamapasoz.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/winefuliwidapekolatutogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+auto+disconnects+bluetoothPDF 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_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 10688 bytes
SHA-256: 3f2500dcbec4fa776c3e2673634f45ce630b9612412dc538bbd6e20031fbd267
font_01_sfnt_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 17808 bytes
SHA-256: 2114c5368aff8201bb65f19113ca88e3231804cb1cd6cbf97ba9b75544d83f3f
font_02_sfnt_off00011db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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