Malicious PDF — malware analysis report

Static analysis result for SHA-256 710236d6df648a61…

MALICIOUS

PDF

90.7 KB Created: 2021-06-28 04:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fee3528e0c385d196709dd6836ecb9b1 SHA-1: 4a776eb78999ab0bc082944961c890dc0c1f451e SHA-256: 710236d6df648a6143b52415d0b6cf5d101673ff11823d79b3cebf3b9cfd036b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or link-farming attack. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=general+motion+picture PDF link annotation
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/v82u5a7a03tmqlcrpa5p1ogvu2/4343311757.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa26724341---ripuxumelokobigasa.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/94011045975.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8de6f1a576---dejojulisasebubemupopobop.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/m72obu9e0qh2719cvm4prq2193/siraligovuma.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/gspgcr69k1kup5o6dtrstsqcd8/52447727089.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f98d9f73e---budozox.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073be6fa139a---xidotenunuwe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c1a9be86d---94337871807.pdfIn PDF document text
    • http://artside.org/data/temp/file/medizazikakixada.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160948980d32ea---dutilemarad.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18eb092e64---59018831454.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090707fa93e7---22813252143.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b37ec30a2---vanobagu.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/bapadubaguxodubijok.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/259a4234d894718a2b1f7601fd404dcd/80739274351.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/dagiwusujudubodufotiwozu.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/df197bba46b41ad30528be47f62abbd1/dimerakikojered.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c910377b---19995751457.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9472f79cea---94086080863.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/71249737696.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0bc93f62ec33502cd7b759d8880863e8/47628181168.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/gatepuwu.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c1ada1aa7---55760515369.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/10754139433.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/23723559532.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FD 17240 bytes
SHA-256: 6beb4227aac6ecd62877aeb3d190e27e6d945dc380cd5de8b72fb7db79a3c727
font_02_sfnt_off000145ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145EF 10504 bytes
SHA-256: a52a202d509103283904a935600d474c56af0bb9a00c14452ee7b6846465bec5

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