Malicious PDF — malware analysis report

Static analysis result for SHA-256 24838acf1a1b55d3…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 20:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fba387ab46237e511be88e53b93ab869 SHA-1: d70435a2831451e95e38986c015f784240af490d SHA-256: 24838acf1a1b55d37e6e12a9a4c615d41dfc61676ca9b0473eac6823ef12ddde
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other potentially untrusted domains. The presence of numerous embedded URLs, many pointing to disposable hosting, strongly suggests a phishing or redirection scheme aimed at compromising users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161339f374d4c6---62170513260.pdf In PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/9adbaf1c557b4a58b6af4e920fc3becd/39714463985.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/26350558406.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/11245419567.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/runifexagoluzipotekod.pdfIn PDF document text
    • http://ahchala.com/img/file/52294340207.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/pivugogabinemajobeg.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/91798169221.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/22573337445.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/29345419954.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e5ec8ac76b846a0aa4b1437d169e8bac/62880450729.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/67860495625.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/gidewasefabet.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-11/20210911082544620742.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/25727680241.pdfIn PDF document text
    • http://sushi-belovo.ru/files/nojusasavawarik.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613303e4289e9---radopez.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/37191859410.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/89560820589.pdfIn PDF document text
    • http://rayer.cn/d/files/fepudasakuveveba.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210913124940634993s4ju3.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/meluben.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/wuvevibapekunotimetogu.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/36205197369.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140758ea530a---28081658663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=kadaikutty+singam+full+movie+tamilPDF 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_off0000da33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 17352 bytes
SHA-256: 822c0c011c148c4f6cf9311730e0aa38dd6f0925291d23527d6565d09e9cdc94
font_01_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 10960 bytes
SHA-256: 27b520af6e886a1ba3538058a98ae64a590beb4bf1c146e62a1689e3beb5f46a

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