Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ee8ddc02cd7366…

MALICIOUS

PDF

88.2 KB Created: 2021-08-22 04:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b44b4ee1100f77270db2e7fec217f63b SHA-1: 1aa3aac336bd628c799c49aca9b9c00a3c5eacf3 SHA-256: 08ee8ddc02cd73660f138c5536fdc6a0e2e0178c3e229eb6f82d0feff37e26c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the URLs and the PDF format itself often leverage JavaScript for redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://albino-pitti.com/pub_img/file/74661163155.pdf In PDF document text
    • http://adria-ex.com/94554421847.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/55093638461.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/11680129443.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/69026954396.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/torujete.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160716f159c388---38009468415.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/650086e8e0829fba32e035a41702003a/vigosiguxamejazosi.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/9717278928.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/a22364cae750608864741bb7126e0108/jexilibadaw.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/vhm47njvo65o0a7hfk55hdt7e2/90662295214.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/tc8b9fmq5gpsst1s10n9qd02pu/89720150249.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b6cf333ae5453d54b9e4538646a66a11/66477423101.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/81efb1f29816d2ca6b7f0f503a33a1b2/36774205855.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/loropesezagakobumava.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/68122937404.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/73506966540.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a62bda35f3a2ab96506a3238ae75f625/xafuwilinegedomakej.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/38082543263.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/69838088517.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090da96839e0---bujimepokipanu.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/kukesun.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/f692f12e55417abeab82227b1f3789e0/83342317455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+final+velocity+without+accelerationPDF 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_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 16776 bytes
SHA-256: 6edf674e2fa5476a8a457a25ee1492575654a4fde3f842cdfa171f1e8df3b384
font_01_sfnt_off000121ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C2 10804 bytes
SHA-256: 2fb268751e7b75903297cc83567551cff2d7fec064d28078cbeb7bbfb3496d36

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