Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a35634f2d6b8ac…

MALICIOUS

PDF

69.2 KB Created: 2021-09-06 03:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d101bc892e1af6c20b757a75b5e972a SHA-1: 739855b97c59fbcc7cbb33978e401cfff4305d54 SHA-256: 03a35634f2d6b8ac16e14005f03476eb81c320f7de4e827a52b1aa3a991b023d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, presenting numerous URLs that point to potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of external URIs and link farms on disposable hosting indicates a likely initial access vector via spearphishing, aiming to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://solarhomepage.ch/fckeditor/editor/images/file/69194027852.pdf In PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/mosobogisofefe.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2b9855b4f5b468aea861b90c08f3a2bb/jalamodeguzarerene.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/doponerusuxagupo.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607de61f3d025---sadaxevo.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/fowesexufejavuruparudoj.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1d52e0ba0---tininorikotokugelimag.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c777e7b15e---98390587570.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/pederakalivogaf.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/95252041037.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb021a2c8---fetonekorusaxinidosobojik.pdfIn PDF document text
    • http://info56.ru/userfiles/file/82819699692.pdfIn PDF document text
    • https://afayl.com/userfiles/file/guvixafojejumudusedi.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/81410258345.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/59801715601.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/60844363523.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/worebojovimijogipo.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/d09d7f5ea7e6f0e0e9dad889e575f22b/60352070596.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b04cdb01ad7---disufanitab.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/dikawatakumavawavajuxobe.pdfIn PDF document text
    • https://renewone.de/files/97936510017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=fight+flight+or+freeze+quiz+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_off0000b1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C4 10624 bytes
SHA-256: b86533b8ebf6c50927043293fed1b3671d6913fab8137271fa93a938c71c59ba
font_01_sfnt_off0000c99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 15044 bytes
SHA-256: 344b02ea87a28ddbc75c8f79fb206983d1a770516adc06c699fc079906214636

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