Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be35a82ad65b1eb…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 18:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: fafcac6bed4e4c07f3229430cfafb466 SHA-1: 9cfaf97679dad739ced17bdc514bbafbf3b8062a SHA-256: 0be35a82ad65b1ebba6f88d5656e4d1039fb8b250f02b133510b4a1952725a06
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://rivieresoceanie.com/ckfinder/userfiles/files/suvobanave.pdf In PDF document text
    • http://domainecomps.com/documents/files/fuwimazudixuwodixivuvowaj.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/berar.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba895ae490---40406399300.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9fb8173c---vonaxejinoranub.pdfIn PDF document text
    • http://montrealinkwell.com/clients/c/c4/c478fb9048b4d856ed1aa16e2301f982/File/53356109033.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5bcd8653a---46305313828.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/vuvodomatowu.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a2f1f007bf444f96fcb842398077c2f/84819433721.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/50573054531.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/feneliwosuvof.pdfIn PDF document text
    • http://kftchem.com/upload/files/milaginenivagokofenegolor.pdfIn PDF document text
    • http://4rrecycle.com/files/file/95012865251.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/jaruzoxedufi.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9840567ab---46809017046.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607be4240ba77---busebin.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/jigoduris.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/pebobed.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/jqs7t4koj9frlraov333k3sb14/sepiponolezajetuzidup.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075f4e03a0ce---81525558807.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094927b08df6---55849783387.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/xofuguz.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5fcea83ce---pabek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=doen%C3%A7a+de+parkinson+fisiopatologia+pdfPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/julisiwifagilaferikulo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EB 10964 bytes
SHA-256: e5f332ae525f07340eb8c99e79e49eca5ecd497fc9b8d33c112a566346d16880
font_01_sfnt_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10951 19888 bytes
SHA-256: e0928b8004dbbfae5b2572adfface88ecb31b1d34d2a87f1647281b7f10d3a07