Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e8eaa0f0f8b0db3…

MALICIOUS

PDF

81.1 KB Created: 2021-08-30 02:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f981f38a15f5cdeab027609ef87f0494 SHA-1: 1e8fdc008533f5fb6d9ab15d1050fd86a2bbc7b9 SHA-256: 0e8eaa0f0f8b0db317871e06b5c831e4f7f6989ef42739fe14c2134d319d7f09
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or to host further malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ht-cooling-j3t.com/contents//files/rijaxanizoj.pdf In PDF document text
    • http://mvpbuilding.com/userfiles/file/8827314497.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/98549456520.pdfIn PDF document text
    • https://2acontractor.it/images/file/53951565179.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/jotokonadazumike.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/59889144762.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0415ab3f2---73803027742.pdfIn PDF document text
    • https://aashianarealty.com/file/mexesidapo.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608317254bdd9---golevulejekakufa.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e71fa97830---dazeduv.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/54297715730.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/ravewad.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/43109237499.pdfIn PDF document text
    • http://capri.lt/userfiles/files/damolafiw.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/xajejetutekomobatuzeve.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/sanutisi.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/gusoritulejolilujel.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/88564372385.pdfIn PDF document text
    • http://lovesenergy.nl/file/80936735799.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e05df0417c9---nedoteligarolorakajemaxe.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/23405411650.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0149a53699---zulipuvajitojugubujo.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/27858789598.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/54254311588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=lucky+patcher+working+games+list+2020PDF 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_off0000d095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD095 18492 bytes
SHA-256: 86d79a7220c7cafa21da1d12524b8aa52e2a5e6b4f7d3bc44c7fcc6abdd3f695
font_01_sfnt_off00010191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 11412 bytes
SHA-256: b56a9900697cbc5bc6f56be0c80609501b3a2add5d42329da305ba59bb1761e9
font_02_sfnt_off00011c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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