Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c2ceb67689cd1f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 08:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a5a5ad81fd3472552a374c22deb65690 SHA-1: 626542ad04b584e408292c1a0a2789166420b509 SHA-256: 90c2ceb67689cd1f19f60001f08d3a38c1d34e7a913d5f57143c606dfc948d8c
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. It functions as a link farm, with numerous URLs pointing to various domains, including those hosted on compromised WordPress sites. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://crewmak.ru/uplcv?utm_term=pictionary+air+app+android PDF link annotation
    • http://yoga-privates.com/yoga-privates/file/josawetuz.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210907040449.pdfIn PDF document text
    • http://vladekoservis.ru/files/87255238046.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e1369507f---95323009478.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/f376kqtrq9d1dbtu2vd75k2jh6/36662464012.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/sevasurewi.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/6057558913.pdfIn PDF document text
    • http://arsvet.ru/img/upload/14851442389.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613454af27424---14683644179.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/tanazap.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/e1ef2eedd7d6a4f8d19f352cbb9e87f9/6524116411.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/202196021577948.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/doputijeximurovobolepu.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/xonenopeletonajexinikefa.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/3099846528.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/28231639085.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/goputakulefexevufoxuzam.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/h4f7k8mepftt6dce34qgnostu6/zituvo.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130cd9913271---gufivonabazutomu.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/lobanetiwuvidisotuva.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/2111939380.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/22027612317.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/1502244021.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/kuvomanumewezekivaxiwu.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/36938882399.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/pozopuzoxulaxav.pdfIn PDF document text
    • 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_off0000e4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 18116 bytes
SHA-256: e063a5606940da4dc1d6604c48b59f617bb5e6c4f8c75590ec9dc2f9b4bd9081
font_01_sfnt_off00011408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11408 10276 bytes
SHA-256: 452785d9d4b18b3e9884726c6f580e5eb919db5527a773d2c03770883e6a6a3a
font_02_sfnt_off00012b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1