Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6746e1f164074e…

MALICIOUS

PDF

113.0 KB Created: 2021-09-02 09:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dd2852447dbbf0abe157dbc0f278fd88 SHA-1: 4828fe7703b41e45e92d9b225c2acf44cdd9de4a SHA-256: 5d6746e1f164074eaf344f20a542533c7cb209b4d44b95e6d6d7ce6ee3832736
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/trfujqacmcrr20r539qo6629h3/ninomaxazor.pdf In PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/xodepufapojebi.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/32085407255.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078a2fc69ed6---tapozijixepifiku.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/99288979082.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/0135e0344ccbc832f6c6c5268cf16516/zojib.pdfIn PDF document text
    • http://cbstav.cz/file/79646174459.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/1126eb364210b88fe9218719755a5fd0/funukopuwavalezuxi.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff2e670211---78266518929.pdfIn PDF document text
    • http://boki.hu/editor_up/180150237.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/vidafa.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/48442565933.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/47444753282.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/632e3b311601fc040f3722c1b8be09e7/rinunijifufavusarubibotuj.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/49351542377.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bd28571dd7ef66558daf9c9365f1ba7a/12339633998.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210626224303.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/dozipajutogegaru.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/vuwudanijidegijepuko.pdfIn PDF document text
    • https://mmszke.hu/files/file/65117465688.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee66cd203---bemupufewije.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d043c8edb68395fab86c02343c81aa6b/fubezazadoninupinemav.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609669cc39867---lusawarenik.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///belizexasuneruwidaguwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+woods+are+lovely+and+deepPDF 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_off00014eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB8 20524 bytes
SHA-256: 6cfc7a48a332c6deff38d2e4e020d4204d8712d8798f978710014f0a03127897
font_01_sfnt_off00018511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D28 10528 bytes
SHA-256: e50d09502ca5641f4265ea6a8500a8550df2ef7d23e7c10148b58f684ae5e29f