Malicious PDF — malware analysis report

Static analysis result for SHA-256 7709df0248e71f46…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 16:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0dea6d723b2fb782fc04bedf3c0ce964 SHA-1: 3c108c9451a11a9da551cf235c91907888499589 SHA-256: 7709df0248e71f46b3625c3cd615f10dca2c762c601ab8e9010f483d5c7ed241
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed for SEO poisoning or phishing. Embedded JavaScript streams are also present, which could be used to further obfuscate malicious links or initiate redirects.

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://drafthe.ru/uplcv?utm_term=astell+%26+kern+ak240+manual PDF link annotation
    • https://vcvscr.cz/www/www/fckphotos/file/69434331474.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/gonuvomedigosotubodanibe.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/32621787109.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/muwobimetuwepedowag.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/bowirimivemoj.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/73300527126.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/tasaxerodaganejofe.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/2f5dbb17fec7ef0bfca2c6d60cf338c6/38823020838.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/baviloremixalexotosag.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b368480ad33---saxamidafazeluv.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e5e8724ac---miselu.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099083189f17---boboroxi.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/begiroxe.pdfIn PDF document text
    • http://kustari.net/userfiles/file/rosufa.pdfIn PDF document text
    • https://agrolliance.ca/ckfinder/userfiles/files/datozizepibepegovuxapewa.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2c22c6c9---45541586997.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098d32c061e5---12064594480.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/47497054397.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/9ab4bbf88ec72aeac61d63f3a772e90c/32807654433.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160712309b0b01---37269708386.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608654f1d67cf---fawituvukero.pdfIn PDF document text
    • https://kawanmto.com/contents//files/foselal.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/r469fles9m3rvaen8cikm84p63/38122501859.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d63a32c34---1454251864.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16112dec660e35---6252261891.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_off0000e1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D4 9500 bytes
SHA-256: 193ff00c1a75f87aacf1500e702c846c7a770222bd045f5119fb69f6ffc3efe0
font_01_sfnt_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E74 18948 bytes
SHA-256: fbead107136694d33f8b9d011641eb46482feda17ff75126d37fc00aaa11e45f

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