Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c84f65b07b248a…

MALICIOUS

PDF

86.9 KB Created: 2021-07-30 19:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5ab34a0b70b24f541da7602d261a84b2 SHA-1: 9abd72eb58c9171a2960a95f91941fce6fabe80d SHA-256: a9c84f65b07b248a7b99dfa58dd6a6cb85b7dd4d42b87be14d9795a66febc7b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/a5nj0dpjl7sqfjqi715icci4vl/xijubumekewelesalixugeva.pdf In PDF document text
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/52445793081.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/71293486444.pdfIn PDF document text
    • http://hifi-markt.org/kunden/kronhardt/ckfinder/userfiles/files/zekemisuwabenuxifaben.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/f46eda4f0acd4c376866de0a39a05025/jenilulug.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210702070653561487syiefhz9zd4m.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2dbff2855f0f3d561ce6b0680ce0a3e1/todufulamozovud.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/845cbc9cf4a7b73d4a3f63c27a77f6fa/98078205486.pdfIn PDF document text
    • https://wecareprogram.org/images/file/4309011869.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/fq8b2pg2p80eh76ndp1u6o1vhf/89786997244.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/a0807aaaafa2ac3802e3080208cd751a/24977632391.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffed5c0dea---resezidazelatob.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea7a6a4648---89339001905.pdfIn PDF document text
    • https://la-klamm.org/Files/files/nimema.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd07fb6eba---75461709985.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8f1a22355---tuwigevop.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/374ccaceac5093a8ea94bfd3cd59b090/80421590340.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-28/20210728181746869275.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/52145903379.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c180f379f0b---91447158572.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/85582061994.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/difoliziwaloromufaz.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/9sb6l83ke3d34c9135js764ar7/99745671168.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/32262078524.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/6lc2l26d08daf332ch45535ctq/37084951577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=easy+english+story+book+pdf+free+downloadPDF 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_off0000f0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DE 16668 bytes
SHA-256: 973ada0a19149fd712a71e3216b231279b94e6bb0f2b00d3c240e58613d6f1f9
font_01_sfnt_off00011c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0D 11192 bytes
SHA-256: 0e496b3183e8960a6bce6662801433d80db5977f952ac0b29e7196c60eaca2fd
font_02_sfnt_off000135d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1