Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab4cdcb5014632e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 20:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 125e36d153fed50aed53bde3bbe4ce9e SHA-1: 1639572ba6c57bbf8d0b75a56434ae0a64a3eefd SHA-256: 6ab4cdcb5014632e6a22e3c94f8cab0c856ef0a8ef9ab77d3c1d1f97be05c615
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and was detected as malicious by ClamAV and an ML classifier. The heuristics indicate that the PDF hosts numerous links pointing to various domains, many of which are likely compromised or disposable, suggesting an attempt to obscure the ultimate destination. The presence of these links and the overall malicious classification strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://zweefvlieg.net/userfiles/file/velofawonibivuge.pdf In PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/wuboropip.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/sigawafilibebefotufut.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/gobolagutem.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210911185054.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/nesofazijibul.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/kegodosewuzo.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/mozijulon.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/62848221890.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/54035967808.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/tabetenasazunorufa.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/2238305438.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613912326e1b2---wimiwamikeribeve.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/69223714777.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/xopegejufudo.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/1295030325.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/lawosokajik.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-4/20210904015456932386.pdfIn PDF document text
    • http://firesystem.ro/imagini_ws/tolijedoweloji.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/mepojerunitopimi.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/bofor.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b739308afb---rifixijavaxuzowab.pdfIn PDF document text
    • http://nenorm.com/files/files/mekule.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/beb8c372a4558d2e9b9aac0bfdefdccb/43825107536.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4213575adef7c3799036802b5a05299b/92400534248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=world+no+1+video+editing+app+for+androidPDF 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_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 17444 bytes
SHA-256: 69ebd1b2bf66e22d36239e33bb8c0d1dc716bf230fab620aa717eef83eae28de
font_01_sfnt_off00010f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0E 10616 bytes
SHA-256: 5b4090e9f7e5a36802553aea88888a17988abe2d4329db2430f11d322c8aa4cd
font_02_sfnt_off00012742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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