Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e1ecb3edcebe79…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 10:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ca51e66d82268d3b6fbdff963914cca4 SHA-1: ee035ae7b87fec2c5a0afe2c18a946de36a0346c SHA-256: c0e1ecb3edcebe79ea74be6d4f25250adb64a4f6cff0be765357191ccde6ef41
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://jandebruijn.com/uploadimages/files/lumeguwakutugure.pdf In PDF document text
    • https://sapsda.org/SapmaUserfiles/file/wevipotor.pdfIn PDF document text
    • https://ka-base.no/images_content/file/45150487153.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/4542160346.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9f1c4ca7f---vifoximumefidubo.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/vunor.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/6b554bb8e2d0d67e7a14fcda9d5b55f3/64090807453.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/2ad432b311328ecaab4856c3baa3f430/lilalivigitivux.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/41078306570.pdfIn PDF document text
    • http://dztechfin.com/upload/file///tawubokinemogifenasigu.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/rebulopirogowotemeniw.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2e575700f10c1ada855760a656b4e2f6/36685133444.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/tumetusigikidumozagiv.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/25452265444.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8214bdbb4---19119167472.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/31896142595.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/77348991032.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/9862500524.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ta7fouj5bul9sv3462vpkl4qbd/danevofazaxomedenola.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/86593579676.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/pujebuxekedibizizog.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/dulezekawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=polymer+rheology+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_off0000dfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 19420 bytes
SHA-256: ab94ebe63cf029788cbab47114494190de611ce955292c7ded43e3ddc5232527
font_02_sfnt_off00012a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A64 10436 bytes
SHA-256: 71c083546aa681d13b08a148bf70029576220b6966800e81274895f18de6853c

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