Malicious PDF — malware analysis report

Static analysis result for SHA-256 f807d3f68e68a6bf…

MALICIOUS

PDF

69.7 KB Created: 2021-09-09 02:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e5f91269051a7b4f3d0498d718c9adfb SHA-1: 8962557756cc36df1364ccfa551ede18ffd747ae SHA-256: f807d3f68e68a6bfd5d036818230a147142c42f094222793c9d0063ee7616024
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d3eacea14de7774665a76990445dda80/kenubi.pdf In PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/90951795530.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210903_6456F093E4364AF2.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/nipasaxixekeru.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/motopijaga.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/88742458550.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/64808143474.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/87496241912.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/55793297901.pdfIn PDF document text
    • http://htygroup.com/upload/files/75575907996.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/buxopaji.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/guwanasedokolesogobelo.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb6701477---92958868428.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/7c4e3ae0e40eaa1090d6cf7352ce2a3f/powel.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328a765526d---gazowuzuwivep.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1jp6vaghdo3e6opqv4fscf83g0/kiruzufawirota.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/25412443591.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/zopokixedujumupinawa.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/kerepiluzowovurekuvimaja.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2922b7302e3df1bb8f1d12c058c7ddd3/57473243737.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090112211173499.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/44566684675.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/31115004515.pdfIn PDF document text
    • http://kaies.net/upfiles/210906202155792717a7ur0g.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/159786525561331fa241f5a.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210902161340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=fruit+ninja+2+apk+downloadPDF 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_off0000b535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD47 14448 bytes
SHA-256: ff9a128e508ab89badca0c5770ce8498c71ee90169ffb7126ba8127690d50ac7
font_02_sfnt_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 10588 bytes
SHA-256: 0bf6d72a95e80c4221bc112c37b441f6153846350012bfa2b7e1a3fc98b7836b