Malicious PDF — malware analysis report

Static analysis result for SHA-256 21707abb62f8e42b…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 10:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a95f910eb0797b2c64d2d9b3ac845957 SHA-1: df41936dabeb33088ef17ac35c60e4f68c2aafa5 SHA-256: 21707abb62f8e42bd7e2b598555dcaf158f244e4269b60517b665bccdf9f1638
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains or compromised WordPress installations, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pixomot.ru/uplcv?utm_term=which+is+the+best+mobile+os PDF link annotation
    • http://littlepearlbooks.in/data/eimages/file/98687577540.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109071350393760.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/sanabexenegijawidodejudo.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/46291182707.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/tedifo.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/10f396bdd3be769393a44e4d5a7c867f/38687049769.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/lonijubexixafiwaz.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/bopuwaluzilojurizu.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d977a15ab9---dileguxewoxukumovoma.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/wadujopitugawumam.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/rowavawukorilagogipada.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/bobujadatopedodegoxonubew.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/siduvorazinodejumasutivi.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/874a64c1f5a01d034cdbc31f244c5fc1/torixonowufotopidu.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/bununo.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139c2f634588---gunedavomaminosunofam.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/94580082298.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130a7ff52092---sinujukakuxejarupose.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133489eac833---mitesajawujafimebelajafo.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ea4498fbe4e36176515a2f2296afefc2/93703663010.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/gemoponuxosifexofulagasu.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_off0000e922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 17516 bytes
SHA-256: 23ae58aa292f4c1efcf4d9a9b8a52b8dc42672cbf4d185f0d9db3fb9a766436d
font_02_sfnt_off00012eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB8 10260 bytes
SHA-256: 9f6124dd2d2bc6edf79c7962c283cf20e9ab8e70b797ff75d95dd70bfe5d36bd

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