Malicious PDF — malware analysis report

Static analysis result for SHA-256 232e0a2d36ff9f73…

MALICIOUS

PDF

111.2 KB Created: 2021-06-26 04:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a608271ebf51890f827b2eacae91ece SHA-1: f6f0d82986cc36b18f0214983139f247c51c4250 SHA-256: 232e0a2d36ff9f73440db3b9bce26c04f13f06a77469269c6edd81ff2ff0d126
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution tool. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of external URIs and link farm heuristics suggests the primary purpose is to redirect users to malicious content. No scripts were extracted from this sample, but the overall structure and URL distribution strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://infrive.ru/uplcv?utm_term=rice+water+rinse+curly+hair
    • http://rheumatology.institute/upload/content/file/41044480574.pdf
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/difelobojilogewa.pdf
    • https://irantruck.ir/data/file/finatupelesedelopofanodit.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe46899e2---datimovobokoribukovamavuk.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076bebe449c4---55751748056.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/9548445f6db1f1ff0e1ea099b7200385/52398289958.pdf
    • http://cedule-plachty.cz/files/file/7780038710.pdf
    • http://classtool.info/upload/files/53035624021.pdf
    • http://cedule-plachty.cz/files/file/bawesupere.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ba14d2c37---85036452110.pdf
    • http://sattamatkapatti.com/userfiles/file/85698461980.pdf
    • http://alkanboya.com/files/file///fegusobosufanusara.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8b5b26082ae67ec7a9c85a4f4b4b3610/xurenoxu.pdf
    • http://studiolorenzino.eu/userfiles/files/lodapotuzixipex.pdf
    • https://bdsvieclam.com/upload/files/botarunixakapituxin.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160823bb5b7201---61566819701.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070710643b51---ladisinufusuro.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f477ee6ce3---64941594958.pdf
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/kenomefogi.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/e209e11cd1aa9a6bd430543f289ccea1/85222888455.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba9bb28c93---tagokujuwalowakofetixaxav.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160948fccebfc2---xuwilata.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/vajipumodazuvu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ee4.bin
5518641dc750a0e2697b301cbe771d635d2effc8cf37f40b61cb3395697c732d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE4 18044 bytes
font_01_sfnt_off00017e22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17E22 16792 bytes
font_02_sfnt_off00019639.bin
c752fc1d90e0d587e27c2bc4a32d1d1c9a2cbdfbb5ddf56ce2e43d43cc88b75d
pdf-font-stream PDF embedded font (sfnt) at offset 0x19639 10552 bytes