Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7de60d29f1de5f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 04:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3962e465e242711da0dce864747d08b SHA-1: 5eb8a53da285e26ecdb60da990e7ada78c9d93f5 SHA-256: de7de60d29f1de5f5e335a1f74b91b10e886b05e700877351e72a4d16c98dfa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The embedded URLs suggest an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://severstroysnab.ru/userfiles/file/mibujit.pdf In PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/mevugurejibopewiv.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210913_C8ED3C278B2A6CD4.pdfIn PDF document text
    • http://metroboxservices.com/upload/ckimage/files/ninosadamizi.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210906_28F3946428EA1C53.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143f59831e05---dunetitazelupefofatu.pdfIn PDF document text
    • http://arsvet.ru/img/upload/57010985225.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/36569710171.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/89477732324.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/tujotababozabekuvedovap.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405d0066425---fazito.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f696a636e294df20b69d6c42154fe0db/34500662410.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/83547547292.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210918100118.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f54ae5dce---janat.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/5717065452.pdfIn PDF document text
    • http://p-energo.ru/content/file/sedofeguxat.pdfIn PDF document text
    • http://signauction.net/userfiles/file/14052654809.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/wesebizaluv.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/tesafizitafimugivafijaf.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb67423f05---kewagolid.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/xubakavifiduvuroviwoz.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/maruwus.pdfIn PDF document text
    • http://saint-party.com/media/file/18468377216.pdfIn PDF document text
    • http://juha.be/_files/file/69522001096.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/kopedafuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+download+tiny+thiefPDF link annotation
    • 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_off0000e0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 10372 bytes
SHA-256: 8f14014c0e24d3b23fa218e87b45b9a0b1a82cdad079ce40731de17534347552
font_01_sfnt_off0000f804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 17956 bytes
SHA-256: 266ce48d1db7f0e16489108f2edb087ff1d198f0a73e6369e39550bb2fdf9816
font_02_sfnt_off00012722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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