Malicious PDF — malware analysis report

Static analysis result for SHA-256 d721ebfdf79705e8…

MALICIOUS

PDF

75.9 KB Created: 2021-09-06 17:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69bd998ab317d8894718031dd391f513 SHA-1: 00344fdc482b9c0c8997402c7dd13e8ed75bd6f0 SHA-256: d721ebfdf79705e8e92785be597c3dd74715c32d1665b62c7c4ec993711557ca
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it's designed to lead users to malicious content. The presence of multiple PDF link farm heuristics further supports this, indicating a deliberate effort to obscure the final destination while distributing links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://pixomot.ru/uplcv?utm_term=weed+eater+fb25+25cc+gas+blower+manual PDF link annotation
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/1b901d83e2b74a7ad0132f9c1f8cb2d3/90133429777.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/68087541366.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/55719089430.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/wofulaviputixulabiwa.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/78cff73cda1f2b84581f80fbea24989f/satenufunirumasilifotek.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210727224709.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608227048351d---sopobapavedix.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/3189888107.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/78003697662.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9c8171300---wativuvoj.pdfIn PDF document text
    • http://santeh.md/img/files/zebedema.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/q8cruhegsnctivr0kbdkphjkbp/togev.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3afdb52c16---2746013374.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/kasukow.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3707d357b---40889943755.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/9c1c63cab7294cbed8740bef8dc12e60/wesukesodakoxe.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b04b5758---91469048964.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611855fc16219---89835033420.pdfIn PDF document text
    • http://thecuriosityshot.com/51904595474.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210815021951_kn2ga1.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ve000gvfb4bg4oummgl03eismm/senitoxewuxuri.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/nezujusivunij.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_off0000c09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 11300 bytes
SHA-256: 30c469f6a0a0b2fd1ffe4d6a786b8c9fb82d9dd35bca65d995858251bb6007b8
font_02_sfnt_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 18000 bytes
SHA-256: 47c0204c6599a2959fb5e9ee6872fa7d0a18816d276d76f9a87dffa0adbf96e4

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