Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed63bb2d3783c742…

MALICIOUS

PDF

84.4 KB Created: 2021-09-03 09:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eae027ea6bd5bddf46d0a61c59b3f341 SHA-1: 04299ff385aec8b1e9166fabe12c98c74d58b9c6 SHA-256: ed63bb2d3783c742ea36439a41e2fcb2461ff21d1bceb80cd82ec3e751d95595
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely to distribute malware or conduct phishing. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://studioriboldi.eu/userfiles/files/57586285976.pdf In PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/patef.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078dc9dc1022---33958012066.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1fcf81d02---76773677877.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/37951401864.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e150238aa90138381cdd93336778e5e3/37338614485.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/280dde3e642a34067e1942c5c936c038/19179482631.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9cc5d7a3---6259253776.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/danemajeloxowinigilazab.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/51511082316.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/23265826555.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3ef22319a---tukivuxumuxaradosorab.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/vowujunomuxawudarexizi.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/wolizepamamilovorinu.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/gikigorubifowonajiguzomij.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/pusanetisoguwokixe.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/eed0625d65e33d02fb5bd49628a4192e/tadigexigosexukejiwa.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/5t1lp4dmag7muke4upmukmfe4m/zuteviliwodofa.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e7413a40a---fabaxevelugesuze.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16090638d0187a---31762616325.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/xagokedezala.pdfIn PDF document text
    • http://garderoba.sk/images/_file/70843016497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=digoxin+toxicity+management+pdfPDF 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_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 18168 bytes
SHA-256: b666c03d4afae349f89e240042e26b07047874af1648d327022db10d77cc0827
font_02_sfnt_off00012ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC4 10864 bytes
SHA-256: 0e84127d92ae0a817ae83fc29ba0b54f00cf9b9923f4541270678e6432d51be8

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