Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d9d37f4b565c3c…

MALICIOUS

PDF

76.7 KB Created: 2021-07-30 20:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e5fb64a41db7b66eba69ecdadc4cfd7 SHA-1: 59ab2407b9122c72aebe9a0028e771f5fce18856 SHA-256: 35d9d37f4b565c3c8c61de144609efb7edcbcbd8fc5d377a0d2a707d74fb9324
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://matchonusa.com/uploads/files/kojibujawexadej.pdf In PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/uiv7ko21ehcb2dhuti7k3sibg0/45757143241.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ov0krpd9chs66kf07rj2g2rlt5/guvubukizedesoduzalik.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d536dfa800ea25677ac353a9cdc3af1a/fabimaxebeb.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a8a9d3f5e---44256738475.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609860944c730---rarosubu.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/59361609648.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/litavugoruwobolibe.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/86316464148.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/08b928598ca5c4ae0b9567df7ae0c1d5/45261729611.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/25609339381.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/b7f35560a6070411235f0ef12f08aab5/1103106407.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/90377154260.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/patuzajarigizizasena.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/gugiduzogigubolijikix.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a13fd4520---xozoseputuvudol.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076790b65e63---jabiju.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec1cb4dc5f---mavunotinakutumaxisolulul.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/68558615677.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/10584900641.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/70651232224.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/2e5ed28eab03f095fcd4c041b30e33fa/25458467766.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160963567afde5---zididibizaxi.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/68644654070.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/68bd6c588609d10d235174f5b3a3a9ed/kaxeful.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/doxix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=problemario+escolar+trillas+2+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_off0000c76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76B 16988 bytes
SHA-256: af31354fa77cd7b1c963c5004ec39ef1b3428c9be49af6ce3b85cb8e4e386c2e
font_01_sfnt_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 10940 bytes
SHA-256: 5c23d11b635fc59a2234e9c58ac862d6cfc09c88141b71268f45f2c43cf8f491
font_02_sfnt_off00010b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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