Malicious PDF — malware analysis report

Static analysis result for SHA-256 c652e16bddba6307…

MALICIOUS

PDF

93.1 KB Created: 2021-09-04 16:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 880ff2acf15d2c19cc3ca222d0a46cba SHA-1: 541f695a28bc41fe3dcc97d2de78a1e92657f473 SHA-256: c652e16bddba6307b1e20aa01ff3e0d17cd38306c2b39584b62bd1a122543f63
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to potentially compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://maintogelonline2.com/contents//files/71115496560.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c7df95571---58292968968.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202108181636161727.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/39944a715339fd2abf7f8f360dc53257/wabeze.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/32280181748.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/82417308216.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/4440152643.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/wadudozidobolosufapa.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/uhnqm91c0i37oqn53vi35aeg3q/kizaxaxovamurokilevome.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e4dd10c51---53693380745.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/51622467145.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/97654110880.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/19061893739.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/42153165406.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/47449656645.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/vemanirokoxajuk.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/13456375546.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021627556404540.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/t4sam6psdhja83qommpcgspout/tonezefutelogef.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/janes.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/94893144185.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607941314882f---35983399502.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/loretamipada.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/941a06553401c7d05b6a42c2891b9a19/debolawikujamami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=livestock+farming+business+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_off00010329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B40 11272 bytes
SHA-256: 1157b6ee00a61d955e479ff152dc0d1bead2f92a4939c8b288f4bd8cb3f7af96
font_02_sfnt_off00013554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13554 19784 bytes
SHA-256: e2e8260d8befddf7c453c60349d0740da76ab17ef8c544fb846e3a66b5d9d236

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