Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d9b23bf2cf0cf2…

MALICIOUS

PDF

91.7 KB Created: 2021-09-20 17:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f34dd152db40364765d7451a163f0906 SHA-1: 265561aba6fed1bb4543f973448a3183c050818f SHA-256: b6d9b23bf2cf0cf240019ef627f145abff787c436caf95bcf949f520d157d0a9
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. These links likely lead to further malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161480e56e4221---mawukadevabagis.pdf In PDF document text
    • https://gizaviation.com/uploads/files/fidemixikumevib.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/wuxozezejalujon.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/risupinox.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/bimefejububi.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/ligisolunosojagudi.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/42321252840.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/90130020167.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/89027546326.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/gibolotugiki.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/29799364444.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/pufekefez.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/36533154394.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/kajenamemebowizifapimo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/brmilshkpbppakccmv9taqn0j1/sewazomifedobod.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/16366965191.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/99086961952.pdfIn PDF document text
    • http://hflchw.com/upload/file/42556057954.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/lanawovobezorududilaxav.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/putogumovomarezagelosuze.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/69916180142.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/fugarowetet.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/eb454b3349c883aaf239ed3725f7b228/51845418959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=zelda+breath+of+the+wild+pc+freePDF 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_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 10632 bytes
SHA-256: c0dc462a7cf8feba71b876c4a8b727b0c2e416bd07bd03f5a412807f4b13fba6
font_01_sfnt_off00011753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11753 19356 bytes
SHA-256: cad489c1622537a11d780b6cea3f1e828a17155949928fc6a8ce08ad1b1753dd
font_02_sfnt_off00014973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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