Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1773720397f27af…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 00:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1bf03b94690248a4b1f2c4354737bdde SHA-1: 773a2d39e4cca063295fd8001348a53f216ec2bc SHA-256: e1773720397f27afeefc46551a017ffa5edd90d54be826347278f4d91e3085ab
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous domains, including compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The embedded URLs and link farm structure indicate a clear intent to redirect the user to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://iamsong.vn/uploads/files/sodubixosoboxebovilad.pdf In PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/xenijem.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f9c1be0c3dff9ff24bc0e5fbf1002cf4/28773971098.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/walakum.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/82046601700.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a510bfe4968---jejakuxomefomomekorulor.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/2qqcp4llloevclrcjui0lhs4t2/31234472134.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/rawizajo.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/zarakuv.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/mevewukizerizuxugige.pdfIn PDF document text
    • https://seger.cz/userfiles/file/44606181901.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/58a06e9f651976a9f91fcc1fe5d1eb68/dipejagureb.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/99581848190.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/85741842305.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c509e5807e---96925289632.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/39469424447.pdfIn PDF document text
    • https://vientangluc.com/upload/files/zovowe.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160db66850e42f---71472088126.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/xopabepijinugomi.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160912757f1f69---65069367460.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16119a800f2fd1---17609814937.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/32826880255.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/40ac97c2651cd5afbe30a7077738f6bb/veduxomokiwadijiju.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/5791093888.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce073f3798d---goworafedanemar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=administra%C3%A7%C3%A3o+financeira+corporate+finance+ross+westerfield+jaffe+pdfPDF 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_off0000c355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC355 11440 bytes
SHA-256: 51d3fbc49faa2e0258ea7759375f9b67adc579fdcd7c9f3a5c14fd90fdcbc5fd
font_01_sfnt_off0000dda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA3 18884 bytes
SHA-256: 1184c9377c3403b41b45ec5ad0c790c23bad23e1484eba50a64bbe10bd23ac99
font_02_sfnt_off00010e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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