Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7b98dafd49eb5d…

MALICIOUS

PDF

75.0 KB Created: 2021-09-08 07:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 80d285b7413626fb3eed29f60aa76462 SHA-1: e229d9d6a13915b9fba1cfd81ef916113437b589 SHA-256: 5b7b98dafd49eb5d78720075d6edcd52effd29bebee1157eccae7564401ed9a8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2725e51b3---69908679926.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/h24055jusr8tvr0kob0ifm5tpn/mogin.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/jizofoterokusutuwino.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/12356449021.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/v407o1e9hgdhcvahji59mbogja/44469888951.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/18595227618.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/23847682494.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/nopaxipejogejivar.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/01c9f156045c609c6c491ecd71fefe01/fidixokezodopipegimesa.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160716b0a7adb3---59460097386.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef9d3f24cc---sifabozadug.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/vupuwefumawowojuvebalol.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/85767457743.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5dc7ceff5b8801b001e2032c5fc6af2b/59595131468.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/50435947505.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/53967428876.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/1813607623.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/52152668049.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1245b71511---98206108613.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/xavif.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b431dea43eb---xebunuwom.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4a527520f---xowizodekejulekosug.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16090f42147dbb---serajuwiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ncert+textbooks+class+11+pdfPDF 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_off0000c2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B2 10780 bytes
SHA-256: d6b4b1bac1c0902763c5b37f8690d8f340fc984e75e1561bee23ac625dfe7d20
font_01_sfnt_off0000db8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8D 16940 bytes
SHA-256: bbf49406c5c520de4b04f7db59be793dcbe78d2f44ad2bcd638a9e43d384fe20
font_02_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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