Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b9f3fd7d476489…

MALICIOUS

PDF

71.2 KB Created: 2021-10-01 13:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b42e3be10d9c05c892432ed8b6c84c96 SHA-1: 958a09961972a1ef63be8d43ec5dcafd05db9843 SHA-256: 10b9f3fd7d476489fe72b38aad83374f97c03f0c9138b34ea907c1511655edc5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=sad+music+roblox+id PDF link annotation
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/f68rbpp98bhqe0bmuop7jdd6cq/vatex.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/88247101961.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/97479649419.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/gowobu.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/71316715594.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c16071b19045fc91c2cad20597101794/88052496886.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/penepunu.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/19167430551.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/rapido.pdfIn PDF document text
    • https://akvaguru.hu/user/file/fexupeda.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/58627352411.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/59085064639.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/25088796533.pdfIn PDF document text
    • http://dreamsurgeryen.net/ckupload/files/19659558891.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/49435836829.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141d0e39d5eb---49900275261.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/66928597182.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/rivesezugexituripigub.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/17749104021.pdfIn PDF document text
    • http://tulga.ru/editor/files/15105862428.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/11295787597.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/gozobolifenegimu.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/11055526289.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfe0dd9b52---bijuvakuvepeg.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_off0000b09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09C 10612 bytes
SHA-256: 408d93444ce981b63e04f5702749dbbe0d8b2522f66b8f8a3d4b4207351e99e4
font_01_sfnt_off0000c8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 18104 bytes
SHA-256: 895260015f842539b2a362971a8eb5ef18bf38e6144665ff1f074f5833609bd5

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