Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c15bc6a99f94a5…

MALICIOUS

PDF

86.7 KB Created: 2021-07-23 02:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c7dc1d90dc68de5213eb5096f938e478 SHA-1: 32929838cf6b07c8b194b218466a2b94cbd6360f SHA-256: 80c15bc6a99f94a567e8fe8bb21c238c50e4faa2169372f4d8b5d2e66565cd7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/55b910789301379af0a275500dcd8e68/jodojitepoxifi.pdf In PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077265990520---matokafumaduvopufovedob.pdfIn PDF document text
    • http://reinforcingourheritage.com/clients/0/08/0860c2a235168fe7e4a745c824023bdd/File/vesezaj.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/13325082782.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/domukiwopilusonavedow.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c506a0cf8a8---74098897138.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ul38j6jd7t4mr8phppsvhe4fh3/33488775458.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b397b0e1f6c.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210620123713_z0wdam.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/194155c79781e8848a801d3c1b29f8a6/pudolevepijujib.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d15b2690e---soxonopudalafodipotogidi.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/pufipo.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sipevibefalevabuxomo.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/janifadosumesew.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/rasebad.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/kurofubunibezapawal.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/46790275256.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7fd542985---ratapizuseni.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/wazif.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16073989f3bbdc---74544172452.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/1dd771c1e422cae83fa4a39120d69e95/rupanefobumolodevit.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/49113997946.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/7a79d4b43db99ff46a78768822733e73/49860930208.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/97737777269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=chicken+and+pete%27sPDF 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_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 16580 bytes
SHA-256: ec486153230ff76e71c95b18098e218a15f2ad84f84baeb70bffe7b169482906
font_02_sfnt_off000133f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F6 10500 bytes
SHA-256: 6443ad5c632d4fa3a5c698bb13999b2715ca3b8bee9c157d9ffdc1d93ffd9aeb

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