Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5d693afc7232d0…

MALICIOUS

PDF

74.7 KB Created: 2021-09-29 10:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d260953463bfa50a6c7ec97d7f2437e5 SHA-1: 95de2f346095c0c80365456a57f9b851e5119b23 SHA-256: 7f5d693afc7232d041340bc5570ff130c004fc86b4d01a72c44d9f6733152fc6
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm heuristic strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/fev1flfh2lp581skqs6fup6b9n/luzipaxezasadofepelasikam.pdf In PDF document text
    • http://ever-pioneer.com/upload/files/jaseze.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/66697727114.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/muxuleno.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/20837630617.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd1a14ec3---ruxuzuvujimekotap.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/85339253608.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161307561b400a---39684204027.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/utcc0qil3ae88711rdi0r6ngt7/jolifinazuxalamozana.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd2fa50f08---xemifago.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161531d13d966a---tepotuxakakimomejuno.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/7983922298.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/2ab662c9cb6c48e0b0eae12ae607fc39/41506689346.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/010901513510.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb660a107---zigalej.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/zubapojenepexuxutu.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/96102170267.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/sapolerofi.pdfIn PDF document text
    • http://lactopad.com/uploads/files/zizamudijevig.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/96884622300.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/57051866955.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210918015154.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc1f9dbf39---58703127211.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb65d177aa---sujidulamadefakup.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/46503793357.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/2299240670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=kung+fu+panda+game+apkPDF 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_off0000bb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1F 10400 bytes
SHA-256: d0c2f45db6b69119a08dfb25683400625f7a09e53e3ae0fd8bdffc224f44a894
font_01_sfnt_off0000d26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 19664 bytes
SHA-256: 9bcc4afb7c7876a3734643a8b5c01e32ed8d7b547be5a76d87f83c3b6da006dd