Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b51ee8721a682c…

MALICIOUS

PDF

73.0 KB Created: 2021-09-27 03:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d26f1efa592a36a7dc621269c6cc72c2 SHA-1: 9d153d339be45107fd7b2a69f0d633e10fb59c67 SHA-256: f8b51ee8721a682c125e5b268a2d57b853d46b8aec5f67c029ffdd142dda06f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to external resources, suggesting it functions as a link farm. These links are likely used to redirect users to phishing sites or download further malicious payloads. No scripts were extracted, but the structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=mostory+mod+apk PDF link annotation
    • https://buffinvestment.com/upload/ckfinder/files/21691517922.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/57308926953.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/60116036136.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/56983912675.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/53759446656.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/luxidir.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6aa34c95d---nixiroxiligamopogobimegi.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23788085418.pdfIn PDF document text
    • http://air-ned.com/uploads/files/22773724919.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/monosifi.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/84961867995.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/fuzefamopow.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/90278503622.pdfIn PDF document text
    • https://thehouseproduction.net/file/dakusowozakojerenadifilob.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/nareze.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613077797ee6b---58076713158.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/povutebe.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/93386958696.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/butidivotebifiwa.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jalavinawezir.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/66503415301.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/649762987.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613df28ed6709---mazibowafop.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/85648937171.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_off0000b76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76D 10376 bytes
SHA-256: 3ceb803994269b35121aeb4fe05e79736a7914e813dc2b7ec8d1c3e745efe64d
font_01_sfnt_off0000cf02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE714 18264 bytes
SHA-256: 5d79da05fa51adeaede10921f06e468f850f0826498d5c6f64416e860e4482b6

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