Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d40de05d0b7da9b…

MALICIOUS

PDF

77.0 KB Created: 2021-09-16 18:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8f8096bb6b6baa4f44bb4264f0c3ad4 SHA-1: 7a1ee5ee735bffacfd83e96e9e128f30c38917bd SHA-256: 2d40de05d0b7da9ba14b2c189b415442d9179803e52290a6932cb2b67bdb693d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The document contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a phishing or scamming attempt. The presence of a 'utm_term' parameter in one URL indicates a potential SEO poisoning tactic to attract unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://allytemp.ru/uplcv?utm_term=hack+wifi+password+windows+10
    • http://buyyoutubesubscribers.com/ci/userfiles/files/67943442388.pdf
    • http://ibconsulting.it/userfiles/files/refivebifoxotinosaxa.pdf
    • http://www.beverburcht.nl/upload/files/zozorowegu.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415652a3486---fumosesonudovuvuwa.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4a9a1bb8---wubozapavopuvifezipufun.pdf
    • http://abwlanham.com/uploads/files/fufudubevolusupamip.pdf
    • http://ahknchem.com/upload/files/66922367770.pdf
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/13540401914.pdf
    • http://elitaliaweb.it/upload/file/92557524387.pdf
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/bewiwobekop.pdf
    • http://travelshops.pl/userfiles/file/74349418939.pdf
    • http://brmhn.com/userfiles/file/20210913230137_9yc1si.pdf
    • http://potlista.com/file/files/jizekovatonurudesujogido.pdf
    • http://avtrak.ru/ckfinder/userfiles/files/lukafefifulubun.pdf
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/tojikikirobudilegipakax.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc5bb703a7---vaxugonilegejizurupi.pdf
    • http://langmypham.com/luutru/files/15893681548.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e6c9517b96fba0bcebdc75fc51679858/delezanibopoludix.pdf
    • http://zbigniewrodak.pl/galeria/file/94942334730.pdf
    • http://koslita.eu/ckfinder/userfiles/files/31634794914.pdf
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/94567333532.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142b6e884915---kiferuvawesaxofoxa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5d8.bin
a54cb74fe30714b649e6f5f0f756aa3ba2918f88bc5cee7de930c2956f336b20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D8 18480 bytes
font_01_sfnt_off0000f5a1.bin
eea6df518f589f2f528d35b4477797ada4be38933de7bd2dc1e61a5293ab8ccf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 10680 bytes
font_02_sfnt_off00010e4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4F 16792 bytes

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