Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e35f92b3359b0b…

MALICIOUS

PDF

93.8 KB Created: 2021-08-18 01:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 61241b2e176cd86d731e52b5a342ed29 SHA-1: 4faed9aab242a16b88488a94a32b27ef35f4f555 SHA-256: a5e35f92b3359b0bd786cbbd884e2136d991c1902921eae8bb0878f359e22951
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific intent beyond the presence of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://peak-experience-japan.com/images/blog//file/88155147136.pdf In PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/365cbde7aa60c64536e967e9304557b7/11187005619.pdfIn PDF document text
    • https://citytrafik.nu/images/file/81440181053.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d9f1dca7e---62873149688.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607844b5cf576---37222869056.pdfIn PDF document text
    • https://epiphanych.com/images/file/27052385873.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/xowatiluwibi.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/45708705031.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/0af777b9003c8161b96cf1f9799b220f/69040236418.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/4feab9223e0d32b466d45770a60111c8/tomejuzizitafifo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610637698f763.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/rizomi.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0b8965bd2---11408832791.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/tagixadujumuti.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/15078098043.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/40230d6db3c5182ac8d2aa2b72448cca/bodalevesiw.pdfIn PDF document text
    • https://digireg.es/upload/83839542920.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608086d5a4890---39491140759.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/gupufesabulixova.pdfIn PDF document text
    • https://wonkingchina.com/d/files/numebabebex.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/8b978e63d51d9a8e512d1301b9699416/46870544473.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/73218904209.pdfIn PDF document text
    • https://loctra.net/userfiles/file/64968757782.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9d090c58b---95020609736.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/sosagitabatuleluz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=python+programming+tutorial+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_off00010991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10991 17484 bytes
SHA-256: ca34ae5034854c98adaa770711c7fd569b68fd9cf30c038f9157b0d8380250ab
font_01_sfnt_off00013765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7C 11080 bytes
SHA-256: f38570ba33e63b9299daa91cf9c95a608a76725f3f374a5107d19acca6f5285d

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