Malicious PDF — malware analysis report

Static analysis result for SHA-256 4960534392b22b32…

MALICIOUS

PDF

86.4 KB Created: 2021-08-04 14:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 03b52668ce2111a9d3148193d1934681 SHA-1: 41b4e45f2585f2d92ac141a3b6f6441cd397919a SHA-256: 4960534392b22b3261d11b2933d88c19fa42757914381f944c0b0e31de8429ee
172 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. The presence of embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting, suggests it's designed to redirect users to malicious sites or download further payloads. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically highlights the use of compromised WordPress upload storage for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://veterani-pushkino.ru/userfiles/files/bozosixuvulufolixubakolag.pdf In PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/fatadaterutumas.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2cc934422---72552115912.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b639421e2f0---zulanivijogif.pdfIn PDF document text
    • http://nature-revive.org/files/file/29041003099.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/dad8a9d73ba3914b5f7c01787065f8a8/ronusufijejizufedinugiju.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/50826154733.pdfIn PDF document text
    • http://liyangah.com/Upload/file/89956405859.pdfIn PDF document text
    • http://bronia.org/userfiles/file/dezokumogubipova.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f9b5ecc63---zetepu.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/jumupizajufozajiv.pdfIn PDF document text
    • http://skia22.ru/pic/file/84372522727.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbc3a60118---vesasoweseweduveruto.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/lujemarojaka.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/26117402180.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a450ee100d2---17954832362.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/peredogiz.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/75726907852.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/16272692181.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/vatisitabubijazider.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/14219812063.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8bf6b9264---rulodoxifefevuvizovox.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa9b625e55a---26519005347.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/42737448c13bdba5d6aeb5acc7d068db/xogakidugumigoduzinuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=understanding+the+purpose+and+power+of+prayer+pdf+free+downloadPDF 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_off0000ebba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 11084 bytes
SHA-256: 60bb7acda9750ec697c5bb7717c6efc9319599876a283b7f5b33d6759bc2ad86
font_02_sfnt_off00011d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6E 17084 bytes
SHA-256: 1a317d30eafa0d88d26c426f7fa8fbcf77a8def491192d3bf592af9d21d5a139

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