Malicious PDF — malware analysis report

Static analysis result for SHA-256 941ceeea704d65ae…

MALICIOUS

PDF

75.5 KB Created: 2021-09-11 08:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d95a5fcc55bf563b9414db83ff497a7 SHA-1: 05768d11c971a6a33574c9e2161f4d429c7dec8b SHA-256: 941ceeea704d65ae752da0e07c1e9f8880136279e7783664256d1da44ecb89e5
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the document functions as a link farm, directing users to a variety of external websites, many of which are hosted on compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://innersolutions-uk.com/file/63263773357.pdf In PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/guvokageneburudowidij.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/wururu.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/miwigafija.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/vafadazaduwubidej.pdfIn PDF document text
    • http://sushibelovo.ru/files/35435226425.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/zubafejovulopibori.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9bd67902e---dorixu.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/29300031522.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/25316080397.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/samevupofujamov.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/3e4968ed38ccc045f8d805fa8caaa2ed/gojujiwasisuvigi.pdfIn PDF document text
    • https://mavibusiness.it/file/talurobofelotazedit.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/68240326966.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/24383880526.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb333a1f84---51371675126.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/bixitikege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sending+cv+via+emailPDF 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_off0000c234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA46 18404 bytes
SHA-256: 5fffe525c60e9792a53767276157281e9fc4a97659a91a1da93917be80c1e678
font_02_sfnt_off00010a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 10368 bytes
SHA-256: 50535f3d893153118777fae9826f101251fd9b6bd9be8304ed55529c78379dfd

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