Malicious PDF — malware analysis report

Static analysis result for SHA-256 373b8355da56cd75…

MALICIOUS

PDF

88.4 KB Created: 2021-07-19 04:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4a386260e7486715a21f148af758289a SHA-1: 38fc1ecc5b92e5c5d0f918c915fa7a4d4e089570 SHA-256: 373b8355da56cd75fcfb458373da03fd690e1468dbbeca143cae556e51d52478
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://on-video.com/movies/movie_data/file/gakudemesulikibikafem.pdf In PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/gozuwowekuziko.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/b36e2522c13dc2dd851540fea2fc0eb1/venuf.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/83902116727.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/8bfcda5e8e55a1de7e5a90e5d3b51853/44966367268.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/fexok.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/xowologalanojudukiwaf.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1e8db6b93b0ba452b60395afc5e7ae43/27074159160.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/mevomafeda.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c7a73481c057f517b3c07bbffcb682dc/fajebirexoga.pdfIn PDF document text
    • http://hydrem.ru/images/file/67537175730.pdfIn PDF document text
    • http://temple.mo/userfiles/file/sejoxawupetenenezex.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/8i0bidlb5ifr5ljncg5q8uea2h/87496827422.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/68452128041.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/t3l28ocp2kd4p05rcdqhrg2o29/lefusaruwemu.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/99524300590.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/biterofelofor.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/21272004225.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210618_EF8C6B87D49F8B19.pdfIn PDF document text
    • http://888chji.com/userfiles/files/nivaneremewexepazokew.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e9ad7db0a---pivokikutatirixifesoze.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803d9200a95---jetelunune.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/19c742beaba8020d671e2a66abb902f5/49399176732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+shack+free+movie+onlinePDF 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_off0000f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 16660 bytes
SHA-256: 37127dc7b60ba6211de7ddddca5cebea08e185465c3c75c92ce281f38796aa2d
font_01_sfnt_off00012455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6C 10624 bytes
SHA-256: 19bb9d1d3535624c61da07ecd9dd50659a72614afd18b2f98bac3ed25d30b897