Malicious PDF — malware analysis report

Static analysis result for SHA-256 800bbec408fb2b02…

MALICIOUS

PDF

76.7 KB Created: 2021-09-13 18:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a06c421842933575a3e0eb8207bd2c25 SHA-1: 27b19573b6eeab88277ea600eee460aeffdbd2c5 SHA-256: 800bbec408fb2b028cceaa4cfb161fb5257380b162857310af8ceb7f87b52462
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://infrive.ru/uplcv?utm_term=windows+10+dualboot PDF link annotation
    • http://mylodge-naoshima.com/images/blog/file/70096459841.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/jitulupoju.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/gikusenuxotafolenakasa.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/sagefisunozakupogupaw.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/mosikub.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/fe1b9ad20c91a85968f88ff834c34ea9/lawud.pdfIn PDF document text
    • https://lordoptika.hu/files/files/sufofusirit.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3aedfeaa687df1ddfb0dd30a22e16728/simefek.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/guwajogeli.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/wemenosodukosad.pdfIn PDF document text
    • https://wittnebel.dk/file/69479018332.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/lujipanoris.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f664b1c247---zitavuj.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161317b7c6975b---josovurekeravike.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac27c42fa1---4380858588.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/15275209809.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/20602817794.pdfIn PDF document text
    • https://upaspor.com/resimler/files/66906291735.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/lunosajovifexibomirula.pdfIn PDF document text
    • http://getvisa.ru/images/File/39984741888.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2bdd0e192f25661fb81398d41e577fb4/48884626748.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/lusatetes.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/muzunipevirugupabuviwija.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/85593151392.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB6 19428 bytes
SHA-256: a4bf392c8354b75cac54a5dc80b6499f27b6687467efcaf590429bb2b5700233
font_01_sfnt_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 10504 bytes
SHA-256: 662f7004a94e15ec8c3ddb5326bef05ab88fb6a7a4f5608d8803a3ac8c5328f1
font_03_sfnt_off00011d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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