Malicious PDF — malware analysis report

Static analysis result for SHA-256 317af2e80471a3b3…

MALICIOUS

PDF

84.4 KB Created: 2021-06-27 23:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20fc7d843e5e6f54f54c89f4bbf114ff SHA-1: 23674e7486c6a82394012794aa39d19f8a5d12e7 SHA-256: 317af2e80471a3b39540241f35e2ca6707b7c6d3cd822052d366103297e1837d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aihyang.com/userfiles/file/jixaka.pdf In PDF document text
    • http://clinical-pain.com/pds/userfiles/files/14367364134.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33639daa16---14295687659.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/cjt49dt559shl7110ltmrr5n5l/novuzuxufokonazilag.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/26473847150.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/prr6fbhgv0qmove7efssifvus0/3659874106.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210620_035325.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/9ces75enr44b0q942f9oi15j5f/nipuruvowuti.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e5ca39815---damirodin.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cb65e569f---93597336451.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/53348526649.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0df35480f---41839884912.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b8c35cfbf---25661553667.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/54015469793.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c566cad8fe---62612850911.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64e5984aaf---63376245621.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/2188221f3834a75548491b2c8377c7c9/xuvidelolare.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/060dldd17e46aakraq2uendoa6/fimuxobokarijekuxanapu.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/987a3f8a4e030daeb8221804077e2734/21292651436.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/2ocspdhed5pgr335d1qab9plr3/jamatebutogefarazug.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a92385eaf86---42102770143.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/42fd7da0d97a40818fe0333e1ab1f716/82555646100.pdfIn PDF document text
    • http://hongdacable.com/d/files/637782190.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/58204423836.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/26422197274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=operating+activities+meaningPDF 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_off0000ea0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 16116 bytes
SHA-256: c2451398ad8d2af71a6d774fb8cf1f58c22a7546d0f11a8f68bfdd99c45c82a9
font_01_sfnt_off000113c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C6 10640 bytes
SHA-256: 8fa902492fb7609d0f6c1a4e278f8d76a1488c1638cb7365023dcd582ae5b558
font_02_sfnt_off00012c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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