Malicious PDF — malware analysis report

Static analysis result for SHA-256 b125659d8b47ebab…

MALICIOUS

PDF

77.2 KB Created: 2021-07-26 09:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd9f6fa0b8a36115f44398e8dda7499a SHA-1: a748b3bb91461f710da66ccfe7c2404f5c5285ec SHA-256: b125659d8b47ebab37fb96deca1ee3601d8d5d485bde86f74de92ff05ea156a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to PDF files hosted on potentially compromised CMS upload directories. The embedded JavaScript is likely used to facilitate the download and execution of further malicious payloads, while the link farm serves as a lure to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://nstoplana.rs/ckfinder/userfiles/files/jaripijomozigowu.pdf In PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/69223132704.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/fabatenadososime.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/womemu.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/1c21eb26f12a38a10096c28a968dca77/60978002260.pdfIn PDF document text
    • http://bliksis.ru/userfiles/file/kalirapowemanededifeku.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d207e6dbad5---67627033750.pdfIn PDF document text
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/97027500853.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05ee548b6---sexepotagepusofevigovez.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160abfcbf87fd6---renemebakebeporovib.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/g9vjo5s9nuutblblaef2u1our5/xorutumutadedij.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/0b6497101010eb09b67114904acd157c/37816117432.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/50a55a53da5c49f7e213206af26506f7/24261615819.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/mesapafepigo.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/60521543608.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8bf199a680bc6b8fbb39e25552f336b8/vofepikepisawolor.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f878d2da958---vixetulibudajewij.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/xaxijapu.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/snv8i62hupnmnagcrr79uei597/kasofune.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/pofukinageduke.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/359d491f1aad56654ba625a2be8c4e8d/jabuvekajebebodif.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/borumojovufelopoji.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/uqn6st878epp3qc291l7gl4iun/xapifalulo.pdfIn PDF document text
    • http://sharidyer.com/clients/863431/File/zozixunetaxigewaniwisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=shell+shockers+blockedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A1 17716 bytes
SHA-256: 0eb1ff0b4968b5234c3dd0faaf86bef7d39942787b2817c856b32e061edf8108
font_02_sfnt_off000105fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FB 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
font_03_sfnt_off00010f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 10316 bytes
SHA-256: 48fc3081a0edcd361be6ecfcc29fe6033027a030ff2562843095394664163e96

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