Malicious PDF — malware analysis report

Static analysis result for SHA-256 f194a07c2f0fe63b…

MALICIOUS

PDF

89.5 KB Created: 2021-07-08 10:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d9fe1046edcf05e7223cc0962e72f020 SHA-1: ad3f93dc5f8875a044f4cec082b46e963982f537 SHA-256: f194a07c2f0fe63ba93a8dce1da4ce2f28b0c2067d5a362f4a2aaf2f70bbf3b6
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://birons.net/wp-content/plugins/super-forms/uploads/php/files/0d3f047bebed45ec08f4e83a8b021fe0/rubuzepivufotogunanejux.pdf In PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6096a4819---vutikejogudijajuripigozol.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609d02cb30d1a---zogolulurunolabalefosiza.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/11154335926.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c13acacdff9---mezominuneboruruko.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/35137502201.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/hd8p1tagb5kmn97iqpj5t553fl/9122746279.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/oh368u0fdhep55n5t0b2ipv46r/74638574119.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6b930403e---bidegolinekiwexezarud.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5311a77b8---77118874188.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/tunudigepodumimixeri.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/71291018105.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/542cqv7d19h8qbkap3td6srogc/90949243130.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/50661545716.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e017e79494---45633500319.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/32snodugovrnikro50evklmur0/60497194238.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/77553522693.pdfIn PDF document text
    • http://billsky.ee/files/file/puwopowekob.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/zaxap.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/38186564781.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/dda67eb3077ec183ba4ed5f2515ae588/14752605961.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/91b04cc09faf23e8b5fcb90ffdab1313/joxezemalaro.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/sojedukomaletip.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/96559074513.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d32b0d101998fb8880dc728784bf2dd1/17707740987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gta+5+offline+for+androidPDF 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_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 17924 bytes
SHA-256: b16fac91a8844bee765963b91180d0fa3f6fa37f0152a2a75f6407978342acd9
font_01_sfnt_off0001290b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14122 10352 bytes
SHA-256: 86639dd13a341951117cf9fbf8f98e552e718e69cb3661d67da2307ba4eeb076