Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e61c1a6a302c93…

MALICIOUS

PDF

85.5 KB Created: 2021-09-04 09:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c5c4cafc63c488fe976117ddd90d48c0 SHA-1: 962a0a93ecb7278888f35548bf6733f269c802c9 SHA-256: e9e61c1a6a302c937a24ec118d97a911b455f734f51ad1b87ff87ddd5bec5672
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to external resources, many of which are hosted on compromised or disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/zewafupewizomode.pdf In PDF document text
    • http://sapaethnic.com/webroot/img/files/88822824531.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/79589533430.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/giwamilo.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/lisolomidodatof.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/1046e89ac1562d050769604d3efd692d/18288044687.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/87327538182.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/tolotetinoxisasamezinerek.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c22dd8bf8b---dalukokofitipozizukazuvo.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/u02gvs2iofklt8qscb5r72lech/47748275631.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/kizixo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/10af5fbba1ac52879721e3eb635dfef7/nogeriwi.pdfIn PDF document text
    • http://innersolutions-uk.com/file/8826138791.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/xirupizotasetedidu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee5e475330---4667157002.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/51103338769.pdfIn PDF document text
    • https://vzglavniki.net/data/file/33031503030.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///pujalinivukavedefip.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/wobafudazetujop.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/fenara.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/ee2dd95064b6f43cb6823b490c978324/gadawututo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160717eadd9c07---bibilajiberizigome.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/josezopifafinaxilo.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/39619606861.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/74958239817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ashrae+2005+handbook+pdfPDF 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_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 20188 bytes
SHA-256: f8e78da0872b352430643d92ddaf78062d734fc8d83e34f59f63ff21cf999b67
font_01_sfnt_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFE 10948 bytes
SHA-256: 251c2226df4ed50fb523b3222973de2e9c36d268216c7db477b79ee1d73e7098

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