Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1dafdbf98282b36…

MALICIOUS

PDF

89.2 KB Created: 2021-06-29 08:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d78a48f8fbfa86f3852fac64ffdcf2d SHA-1: 03750c7d8271c5112f755e240298cd932c4e26c2 SHA-256: b1dafdbf98282b36a5e154cd912b8a8ca34f7cd9005c5da93d8a4ac68aae58da
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised or disposable domains. These links are likely designed to lure users to phishing sites or download further malware.

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 http://cosmic-kino.ru/sadm_files/bawidemarusizusemexidewe.pdf In PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607467c6b0556---63046690044.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/kujitaz.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/13487767835.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7a7b339ad---bekosituxij.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/xopodasizozurufolixa.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa41ae15ba---ranadegugumekapotijeki.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210518001655_1108499576.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/kofawikiro.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/kedoruzojamivat.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bc147d519---pesilagafukunanaja.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/42595616890.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b221376729d---duwafemixa.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/7a8a0894edb462fc5358342698ea4609/mogolebadewovoni.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d77251f10---sazax.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608135a442232---56917001696.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de3b8a18bb---jemozirevugoxafikitomam.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/wimogeporadonaneretowuwe.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c136a41bb12---texunute.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/luxuvulemaxubepokogamumo.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607243df672f8---11471133186.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/ronosazumemunelulibixo.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/6410439f50b0ddd50dd0339b06d372e9/kinaxolururajapebu.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/wexojarefololuv.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/mivorazafebuvigupopef.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef7bbbbdbc---87344132873.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/lotibekizegonimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=electric+arc+meaningPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/986eef02f86eb67f5f935758488c5ba7/kuxawolemimabokilamefo.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 17660 bytes
SHA-256: 515c3b59d2809dbceabae9d668cd8ae023c9ca807d2e61876a0962e255d75a81
font_01_sfnt_off0001284f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14066 10268 bytes
SHA-256: 39561503eb329a86441ae40273e500e3477786a5aec28f2b12fe4d7ceec63906

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