Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc426f9ab2be727…

MALICIOUS

PDF

118.6 KB Created: 2021-06-26 08:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 814ff163effac42fcf209fcf56a4bc25 SHA-1: e0322f4eaa8de73574ef5fdabc2c43797ddcb8aa SHA-256: 7dc426f9ab2be727061fa2593f9d597e2ba5fbe530335c19c378fff591456ea1
96 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination and potentially distribute malware or conduct phishing. The ML classifier strongly indicated maliciousness, supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 5

  • 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://medvor.ru/uplcv?utm_term=simple+chicken+pot+pie+with+biscuits PDF link annotation
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbb13d8f49---nalepodetalutasilati.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e2e4cc3dd---24322098615.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f2b57c60b38620f3612c59625763bfe7/69339454450.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e2f037ab287db5f3da6683dbb26329dd/duxovobudekagizogapawuzip.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/nodavujoxazobon.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/96939609437.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc9f14e9d---muzefesoxalinibufaz.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/wujoxanofikitoge.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e425e96f4---xiguvilasubopemeputiwizam.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/cabe0895176b6e2735b69c2580f62b13/xuvidede.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6b40690ae---tazixiruwadojelovevep.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/rvmcq4h6c66574heq2h4nedq7j/xedepez.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/cb535558fe2fcf62258e14d523f24d3b/47215314807.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0114928ed8---37498218389.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/44484903164.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a916804ba73---geleva.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a14cf166c2d---93889361930.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9c740d8d9---88787183983.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/66846379846.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jgjn6a0ht092akc5l2dlbipslg/68818840113.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/3338562163.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9cdd092ce---45119735786.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000153c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C7 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off000169d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000181e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181E4 19016 bytes
SHA-256: f1d65ec30a8bc1d7c87b33cf08c20cff884a7bd251759eea9a17df8820e22dd5
font_03_sfnt_off0001b3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3CD 10872 bytes
SHA-256: a8eb40b8c76f7e25363a8f6e5d7665694413265bbb085ba7132a6784f05e48ad

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