Malicious PDF — malware analysis report

Static analysis result for SHA-256 455e0ccfe23890c3…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 00:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c72bcded9c28721b04ccd502cf909be5 SHA-1: 73becdb52efab6ce401ff644a9da7b3c971828ea SHA-256: 455e0ccfe23890c3991868b274776b0a923bfdb12fe825e5e042e12fee69a86f
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to potentially compromised WordPress sites and disposable hosting. The embedded URLs, such as https://medvor.ru/uplcv?utm_term=descargar+royally+screwed+pdf, are likely used to redirect users to phishing pages or download further malicious content. The PDF structure and URL patterns suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=descargar+royally+screwed+pdf PDF link annotation
    • http://rungruangsteel.com/public/upload/userfiles/files/1737071004.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/sejebolupemup.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tarotoregowuwevapelupa.pdfIn PDF document text
    • http://aven.su/userfiles/file/69979198187.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/xawozazojazi.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/duwipokigedolafe.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/rumaw.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/fugutodekevuzuril.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607204ea579dc---vedizavirirawoba.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e82153fa---28826364669.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/dojamasetoxikinup.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e29358d9404042c49b3569dc7ed8fe69/kigibizokamoroxipijix.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/neweratogalowibebibek.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/p3qobnt2c25gs14npmvikd6sjj/wogodurufewiboxutazek.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///96637598586.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/zejelirowup.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/88904905939.pdfIn PDF document text
    • https://toocapen.com/files/puvikiwo.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/1955667258.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/20047340286.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/q7ar90v93tgs4c39bhdkpmpjq0/gexirirobamatidutibiva.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/3d44a37359b8254df821b9cfdc01e738/90199691692.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/02cadd79417e789d52779949c8b7b1bb/kopimejegi.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/92292639959.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_off0000d596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD596 10704 bytes
SHA-256: 36b7c0550dd76233b3ccb4d9f4fa7714f97bfadeef2017f47d47e3ed290eb949
font_01_sfnt_off0000ee2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 18232 bytes
SHA-256: ee4e1ca46c41eb9f91a6a2c4dec7000e56d071cfe621fda40718a8ad80419b0f
font_02_sfnt_off00011cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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