Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7df11bf5f3291e1…

MALICIOUS

PDF

106.9 KB Created: 2021-07-14 02:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0572df1b6748b99d972f98e73b6b8476 SHA-1: 668416edea39d079f023af99687188f8bc443e1f SHA-256: d7df11bf5f3291e16cbae782b000bd17f3a3bd74bb846d2a9bc7c2cad54ea133
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://archism.ru/uplcv?utm_term=warrior+pvp+classic PDF link annotation
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/1329e9a1ab55119a1933acd461282428/fubafujolowag.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/39b9c75a53f0dfc5cc017e1f191feb2d/22450881004.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd5143c199---46469401686.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff58a82477---kudolisizovijutiwef.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/82321648500.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c914ea4eab---85013465462.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/vifinezikodij.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/97508570457.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cd6ed0f38---wapegamorufebitex.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e797229e7e34caf5bfc47b6b8a3a6356/fitafelogizadolan.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bacb509d11---75443458436.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f844ee63d9---zepuzigoxakotu.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/bazajeropulapokubatoso.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/wikepisexazigagezavutepoj.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/bupadipatonijikumuzon.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/lj63uj8gikv66tff2gl2pq3rcs/jubaveborifetuxema.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b99ef4ecdc---49217685541.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/nirisasa.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/37305651938.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaf98c78dc---35219743681.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f5541fd49---fidexopuses.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/treeenq1pp9jbl63gggnqdaaei/nedegemawapetefijilo.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4B 10092 bytes
SHA-256: c842969f85be1ccb5941c9ad5ac50f384283152ad156850f2092c7d14dd6f31d
font_02_sfnt_off000164e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E4 18292 bytes
SHA-256: be757d2ad5e5ff845d6cfad9e7f46680d2de7dbcea74690d2f9105f4f60f93c2
font_03_sfnt_off000193dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193DC 1968 bytes
SHA-256: 3ed1afe2710e4a03418acc0e92daee0f10a3c02159133ce58552c2489f9eec91

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