Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da2f6fbed07e775…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 15:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8f8b71b260fd90ccf8438a1b7ff16e04 SHA-1: 97b0a1f910ff9c6d2b7431a65f1d58c5f97048ad SHA-256: 3da2f6fbed07e775c972e9dc6247f8cd3235343626d60b44cbb842e8f42b28d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://smidgel.ru/uplcv?utm_term=trituradora+de+papel+manual+en+argentina PDF link annotation
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd6377d219---60390491915.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/ridodanojidofiduzivazif.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/risesowevuloxomibikopami.pdfIn PDF document text
    • http://strandedtattoo.net/file/gabajavonaxipetafepe.pdfIn PDF document text
    • http://bienenaktuell.com/sites/bienenaktuell.com/files/file/nebukarifakite.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ee64c1aeb---ruzegavusal.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ae7508ce5---32314876670.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7bc205f0a---foloremabobijo.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/tuvapupowagurutolalipoxi.pdfIn PDF document text
    • http://elitacasa.it/images/file/degepi.pdfIn PDF document text
    • http://humanlitech.com/files/files/zutomobur.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b708cca75fc---jilakap.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/ratiluzerejujiludutupi.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/jujobawebuwowifet.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/bgu07n89b8g2088pluos8c6cc1/59004141920.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/ninod.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/23733154085.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/df9687857cabbf75578965e9d9b4e291/welewaxidudevelowi.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/puzerurazowuves.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd3b3289e0---fuxikotiserib.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3c5f15f40---vidujunizupujiwofolog.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ck36a2vefm4sdlnftcgi2p9e32/56594216771.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/xoxedadesugu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A2 19860 bytes
SHA-256: ea8b4e4ef77201fd8aa4eb993f207a252c110e5663572ccc3048e85f52b17627
font_01_sfnt_off00010c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5E 10632 bytes
SHA-256: 9e7e3ebb0d779efbcf4fca0e8e9fa54a7d62d6728897e02be64e448d5af7b6ed
font_02_sfnt_off0001245c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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