Malicious PDF — malware analysis report

Static analysis result for SHA-256 5559416193dceb8d…

MALICIOUS

PDF

85.7 KB Created: 2021-07-03 00:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 45f65c3a795954b90e4d34e8fb17e48d SHA-1: 1be072de5b6a31401e989663386618afca3cc6d7 SHA-256: 5559416193dceb8dc03474ce1e769bf7b0e769eafee8a4d5e82226c3ed61b17b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which appear to be compromised WordPress upload directories or disposable hosting. The embedded URLs suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://nutstudio.it/userfiles/file/64298995074.pdf In PDF document text
    • http://jjmcp.jp/userfiles/Image/file/zofixojoli.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caeb00757d8---kodudusiti.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0b769ae37---39064406318.pdfIn PDF document text
    • http://gdaniec.com/upload/files/rirojatesokoma.pdfIn PDF document text
    • https://sambelteri.com/contents//files/burojusatubelagiloge.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/29733776655.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/356cm9daj7idh7jar1kak100r5/tujorumenimagez.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/j8d6bku5bovolf71tsrea2jb10/bomowamavofade.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d7b29d6f4---govirovegexutazunib.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7ba718b75---45977452904.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/ruvavibimukapini.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/io423l1tfgke43deqh77mnemg7/91879949535.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090c0beb08e8---47908696451.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/xotara.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/2s440ch0eohbn114c6fcel9t52/lopupefozepagujerusan.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/q8kncov6uunkh64b8snr28e8vk/86219868137.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/r6btg18njvpv85ai9rpi6g6ae0/4163897007.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/cb6983ef2d4060bcdb579662a6daec93/33573165783.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/zurupoded.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/73797513341.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/87639848371.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/demuzikegapajevaduzifaneb.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c07107242d1d4f319247e973668d5a0e/33928598338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=so+out+of+breathPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/3af0551fc3c3d13eb9ac923ac270ec8a/nisivelavileku.pdfIn PDF document text
    • 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_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 17328 bytes
SHA-256: 5844543fb196c15461a89e8ec05c68a4873e4032a7c74ff294b3757a17297d57
font_01_sfnt_off00011aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C1 10216 bytes
SHA-256: 0a2433eaa962fb6ad53926254d00de864d19fe428f077266e5bfffd04c3a478f

Open this report in the interactive analyzer, or submit your own file for analysis.