Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1a7c5d648562d8…

MALICIOUS

PDF

87.1 KB Created: 2021-09-21 01:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f2a937fff1b6d6c61186fbd61d5388c SHA-1: 9148907252dd5c0e675f098777b5a9b6094cc6bc SHA-256: de1a7c5d648562d8fa5027224e17571f626a49293518795e28b216817b5f4cfa
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The primary URL, 'https://drafthe.ru/uplcv?utm_term=one+piece+season+1+episode+1+english+sub', appears to be a lure for search engine traffic, likely leading to further malicious content or phishing attempts. The document's structure and embedded links suggest an attempt to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://drafthe.ru/uplcv?utm_term=one+piece+season+1+episode+1+english+sub PDF link annotation
    • http://thietbiantoanttk.com/uploads/files/66422728269.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/5982593709.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/22557910223.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/pazabugefizumokemozifedu.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/agnlp3ru9klgdt4jksc0rskibg/10442472247.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/19750650720.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/jurudoruzugowazavufus.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161407f69353d8---11696887702.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/pojudebaj.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/namij.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/wafotakifuni.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/1937296331.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/fogozenivivexen.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/puwisubuwoludiwovagem.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/15895193626.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/pivufadutoso.pdfIn PDF document text
    • http://balalajka.nu/media/86708746296.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/50449006001.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c0f82deb80cb0669f02e4f33ecd4fd12/68995950662.pdfIn PDF document text
    • https://olterus.org/contents/files/1328891931.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141f17f7e4e1---40102479450.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0ec337198363c6f6093f9eace3f03c50/46789737527.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_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 17464 bytes
SHA-256: 7296da74e0e3c5705376b7333f2e3cac5c4c119822618b665211d4aeb38891c8
font_01_sfnt_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13607 10912 bytes
SHA-256: d9897c1eb5dd1d3019b370086857c6285b54250762b1cea57ea5dfdd5871b7fb