Malicious PDF — malware analysis report

Static analysis result for SHA-256 0597c1e968135961…

MALICIOUS

PDF

72.6 KB Created: 2021-09-01 01:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1e2f39ec7d351d3ca2c4ae497cd853d9 SHA-1: 9ebe91da7417967e26255b140035bc9ae5c1bc19 SHA-256: 0597c1e96813596189381a184302579cd1e9cd1e1c98dd22d94cb2a975a63b8b
164 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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://arci-mp.fr/admin/File/zurawoxetobixijejujek.pdf In PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac90c12501f---58306324995.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/kitupuragivezavodivil.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021073021151781.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160947479434b2---xinebajesokonijojiwebuw.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/qgp1jhio2qb9q5iodk30d26c55/57880376837.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16085e6470561e---97787791755.pdfIn PDF document text
    • http://theponghop.com/upload/files/loruwikesisunuludunemim.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/95344754899.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/gc7jqgcjjt6fhnbmsgdkmjbn8r/bujonudimozamise.pdfIn PDF document text
    • http://deauville.ru/files/file/tudapatusak.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/77250541937.pdfIn PDF document text
    • http://xycrusher.com/d/files/47812711754.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/gb6q963pq4ppo7ae34sngpamf5/98790124292.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/9828780281.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/xarajad.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9d873e737---ripafopevilolivuj.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/61096522949.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/69886846745.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/5753440590.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/marilakepojubazivumurur.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/tejutodutubikow.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/246cns03rogma7172fphohd655/tidevamisudadisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=types+of+suffixes+in+english+languagePDF 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_off0000bc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9E 15392 bytes
SHA-256: 94373d239523b7392db3b9c5976c8252a92e6cdae91c523263b591e85965d27d
font_01_sfnt_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 10716 bytes
SHA-256: e447f0e3448beb83f7c9faa2fd19795b30ddca8f34ef62e4b10742949b6e2359
font_02_sfnt_off0000fc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1