Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f00d673da97c76f…

MALICIOUS

PDF

88.2 KB Created: 2021-08-03 03:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88eaf8c41ea1dce40a04067819c6da26 SHA-1: f62bbc253c829e4f3443763d89196ac8233fa5ff SHA-256: 9f00d673da97c76fbe10d770f5399e9f089743877e0d61b7943474e5fbf1f9e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or are part of a link farm hosted on disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to distribute further payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fobas.cz/userfiles/file/50332348102.pdf In PDF document text
    • http://castudio.eu/userfiles/files/wipikidigilowuv.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/kejirinol.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/dobitugegibodatizoxo.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/lopipi.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e957ada83---sujepokujariwojoj.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b32d3683709---gibikudanuda.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/masuzuvagixuxobofen.pdfIn PDF document text
    • http://plastikacz.cz/soubory/files/24739846147.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608002e3bbb26---68879254147.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/04524814af140018d8c0c7e73b2c3e98/jirosolegazelulut.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210516194627.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c48396b825---wagupukinanun.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607497f2a4546---xosifaxiwe.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/setojezajorem.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/33655420158.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d740edbab486262db9ad10a4bc6e4bb5/45077744175.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160841acc71baf---jegin.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c7e5c6c5c---93544686697.pdfIn PDF document text
    • http://fkhd.cz/data/img/deledotomuzirirubidop.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/xavakezedotumibizivapufep.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/jovobor.pdfIn PDF document text
    • http://valeneighbors.com/userimages/97538452352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+remove+carbon+black+from+skinPDF 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_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 16724 bytes
SHA-256: ba0a50c4f2ceba8e3e256bd1c060dbb2124a3a4e6fc1dae1207d67814e93adcf
font_01_sfnt_off00012107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001391e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391E 10872 bytes
SHA-256: aa2fadec2cfe58625420053687726d41d9155b6070950c661447a8ac16c4b0b7

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