Malicious PDF — malware analysis report

Static analysis result for SHA-256 398e8587d5054f0d…

MALICIOUS

PDF

78.6 KB Created: 2021-09-02 04:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: e73119a7127d5ceb6a650b46b6f4aa67 SHA-1: 2ec5b436ab9477297f27b9f84ecf322bd4e91b81 SHA-256: 398e8587d5054f0de4fdb7a25c3893e67fa44fd000ab5bde25e597289755eb53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=your+speed+should+encourage+a+tailgater+to+pass PDF link annotation
    • http://fgosvo.ru/files/files/dodumevuba.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/ratadututoxelodulisuwa.pdfIn PDF document text
    • http://zuche0551.com/upload/file/45928901152.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/gikobofesagadote.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612bc44817be2---89096359689.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/75241128314.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q1t3rdv1rbsovk06slrg19qs73/87543043564.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210806121429.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5b84f815---bukekode.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/lamelalevipipawekexu.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/pamevepekokojanatawagiwi.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/19504134921.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2449e82f335308dadeea17c4bfd75cbb/25851781917.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/77795105548.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/pefolakatiruxotokilex.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e792ee1de---24363911402.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a36b4d68aaa3e4910157773091a297a1/vijajinetudifinoduju.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/72683477744.pdfIn PDF document text
    • https://mauspro.net/upload/files/94569619936.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/mimanumobokanesopegi.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/dunukaxipodafibisuji.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/3a8d87deaa6266e65faeddce138df4b8/33672209842.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/doses.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/guzidetupesaradugo.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_off0000cff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE808 16424 bytes
SHA-256: 514ab02baa6737d74d02829faf394e3ce29978a188967d1205b880e6f6762643
font_02_sfnt_off0001121b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121B 10876 bytes
SHA-256: 12a8ad926af9468fe9d216803dfdbaaee2025273a499ffbd1bd332fec65df4b8

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