Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4cbd44d5b8484b…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 01:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98328eaaaa36d9e5f52e81eb4ee1fe4f SHA-1: 67ac4b62162041e25a7bbdc76b2e0fae08d90617 SHA-256: ee4cbd44d5b8484b36971bd2183d94aeddc8f1483ff75e923a5aa106e5be8fa6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URI heuristics and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

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://inwebjor.ru/uplcv?utm_term=brooklyn+nine+nine+season+6+online+stream PDF link annotation
    • http://gaudi.tw/upload/file/kowogu.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/17712163774.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/tafiwulepelotaguki.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/dokeriwubetapesolema.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/45591241627.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/gonupijare.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/tatigekimapin.pdfIn PDF document text
    • http://adice-area.com/pictures/files/15422029354.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/savurokipoginuzavubaja.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210925123317.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/249ef2859e8c4e87913ee79df607299b/fewusafekam.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/wugamuzi.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/lisatetegofidiruwagidabok.pdfIn PDF document text
    • http://ipceurope.com/assets/file/sovexevuperufosoxitukekuv.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/87834869351.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/14234201793.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/56055024504.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/mowadegujinosotemimetot.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/41821215078.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/acd5p9teu7fs53hu3knc4ooq34/bepivufatonadif.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/dajewetuxefejaman.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/63669751937.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/38145593703.pdfIn PDF document text
    • http://unibox.lv/files/text/30816127102.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/toxufi.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/feb116ea1c977eb47d7adaae89fef0e1/ninaguzijobefotoka.pdfIn PDF document text
    • http://moristas.com/userfiles/files/vaxogikevojusejiwer.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_off0000b1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C3 15740 bytes
SHA-256: 19e541c11305523d8f39e3f69cdaa50cf31db0835e52a8c80174166331aabdd3
font_01_sfnt_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 10696 bytes
SHA-256: 34c351dba77b61c59a5a5c3bcde08af5289830589f363688e92d1902ee105459

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