Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c00b95bfe73b537…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 09:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: de0f919b8430ce82cdcf8b8a6c4806a0 SHA-1: 16d186e5cedefaab358406fab7965c946e4e12a1 SHA-256: 9c00b95bfe73b537603b6b8bbfbfe346beee70edd1c87040eef86bcc24facd52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or engage in SEO manipulation. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16092014914c7a---71986717476.pdf In PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/43d6bbe30e4ae7a9364b256c35045531/69769973944.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/66995992563.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/m0r5paeo9fvvfdg8iqmme3q270/vinunu.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/71860288453.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/10557775008.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/2703257302.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/826f91ab399430ace94d351b0de16587/mugufagupidanok.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/db3cbfce55605768100190f38f4b97e4/tagisudoroxatevirotatag.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/weniseku.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118323b29b59---32187574831.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/bogomibawu.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/36093945248.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/fefavuxipusumojado.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/1b31b204101ddb5f2139854e624dc6c9/94677122160.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/motomebelovikevizu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57b3d58ec5---26802529068.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0c5d45a9f---zufejudazusiriverab.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/36701020417.pdfIn PDF document text
    • https://binhvi.com/upload/files/15590949342.pdfIn PDF document text
    • http://abwessex.com/uploads/files/74197155289.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/84vm1f2pagduju2317h5rsq13f/batewijitovusalodejakifup.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7b5e1d21b---niwosigugek.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160723bbbd3816---rugonaseveriwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=jeppesen+instrument+commercial+manualPDF 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_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 10628 bytes
SHA-256: 03c56b47ade02971d974a07a2ae2fed1f7a137b6e7cd65320e87c95994a41ec1
font_01_sfnt_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFF 17624 bytes
SHA-256: 6451b678f78d403d7e00189d6883da128b5ffa1e4133855b67e6fc8948b97e6f

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