Malicious PDF — malware analysis report

Static analysis result for SHA-256 413e9a2d8cba3090…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 06:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0a5b3df3d1a5c61749ab89861df757b7 SHA-1: 7ffc949e894c1960f8432d14569b4a3e14dfddd2 SHA-256: 413e9a2d8cba309011cbd2be57b6693f4afe787f695a4d48e7b31b9000d853b1
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable or compromised domains, including a WordPress upload storage. The presence of numerous external URIs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://finpacecuador.com/userfiles/file/29009848188.pdf In PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/18239415135.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/42466962833.pdfIn PDF document text
    • https://ms01bet.net/contents/files/golorit.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/40490230796.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/bupopalatunedazodiz.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146311b788a5---gimizizinabu.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/kaduzopilumipojumelusire.pdfIn PDF document text
    • http://agilesolutions.in/uploads/bagirawokazama.pdfIn PDF document text
    • http://teplospectr.ru/images/files/jufezugeviduru.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161365d30cf831---sizawiwaje.pdfIn PDF document text
    • http://domosplast.hu/files/file/16859103338.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0dd1e8b01---95938853676.pdfIn PDF document text
    • http://e-hematologica.com/users/file/fabexabepugixiragaluve.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/megototijiberuzifu.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/39377645484.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/6598253796.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/34911787252.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/45611110766.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/barip.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/lukavadivetasomaz.pdfIn PDF document text
    • http://p-energo.ru/content/file/50516958053.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/mozolonavibobago.pdfIn PDF document text
    • https://fratellifurloni.it/file/16360272992.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/wukugoserofu.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/53902977882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=watch+earwig+and+the+witch+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_off0000e66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 18492 bytes
SHA-256: 1d3a443b27caadecb6ab365e208586b237009b685865586a9a36000476fba4e8
font_01_sfnt_off000116a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB9 10560 bytes
SHA-256: 725c211bea67b104b06ee6be4a428e9934e9574ff95428fe692c640159c46f85