Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd8774c4390ed6e…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 11:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: f90c844577b7306502027f8dbacfdc82 SHA-1: c2e6c024629c86b115fb668612b1afb6a9b55b11 SHA-256: 5fd8774c4390ed6e2aadfc560fef17bcae2f139211b2ef67aa66fdb85ad48a55
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607145a6e9d0f---zedokal.pdf In PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/lufubatuwujavox.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/500d4946908df13b50e41287351a106d/miderokororoxomerizo.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094e01b7a356---57638532210.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b14e6d105e89c3d9e599b194fb91332d/kesozaraxeka.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/j5db8f3atl62mba4j69710krm2/wozutexutulupalugipewiloj.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071e86160cc6---fabudur.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2808b38de---78493762325.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ver1eijpmeubnl38f29hck113g/65961310939.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/weduri.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3bc04hedu0o8dodvtk6ojgud05/80824306959.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/getemumorajekex.pdfIn PDF document text
    • https://ocbond.org/userfiles/files/67451200273.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/muxakimuririt.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/8934f3b16ba27dc0b573a4ed2df74162/69699802670.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/7a0d80fbeba7253de2d9e4b5ad5acb12/vadebuz.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081ab7d80ef9---rokorifanukoralepoj.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210611_174826.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/vebetosox.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/99f32686a9c5782b5fa1d57040166bdc/51294295416.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/30975817079.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210904065313.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/6933e545f355a141566081b10333d78e/65121627444.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/21090156804.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608496145bdf5---ropixotufe.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c05eb7cb683---rarafekit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=logistica+empresarial+pdf+libroPDF 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_off0000ba93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA93 10956 bytes
SHA-256: 77e060f6720de06bb006fd14abb6112993e46adb4480ca0c66ada28b46348e99
font_01_sfnt_off0000d395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD395 17716 bytes
SHA-256: c6474f5308abdbfd7ad7ff08d2a06736fb23b14f8c99eab12c9a0a0713d61ca5
font_02_sfnt_off000100c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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