Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1f719cddba6cf6…

MALICIOUS

PDF

90.8 KB Created: 2021-09-06 12:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e2ce13c2f407996688da270e9df09e1 SHA-1: 5168ea59e503151db480b215b9051b9854994197 SHA-256: fe1f719cddba6cf61d3347a68d9015cec4dd2178a28b6159aa1a56a0236e4826
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDFs. This suggests the file functions as a link farm designed to redirect users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://philabc.ru/uplcv?utm_term=beautiful+in+white+piano+solo+pdf PDF link annotation
    • http://flightshop.jp/images/blog//file/pizunujukagagopizunanetif.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/bnvk9to7i5hol40uudcfoeceh1/ralesawixiganikowidemoba.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b21ed79bd---parutifewuvojelumapusik.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4a408327d871d336fd61aa7ef80d54e6/vawibumajagezej.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/712159363.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/2ff143a64bcdbc95494f7652bb62c395/5936261995.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/91235381506.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/pilemobaralepobapa.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/b8395adc4356771452371882a47ceef6/88129100512.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/42463757754.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/vonuvibeximupusajarukiv.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b05f2c8d95e---82958794134.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/xiwepiworatitugaliba.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f1509b70d42---fivafanexeboteled.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/46670558341.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/29666320440.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607afa875fe90---mujikes.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5975293598---98993089021.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/91042493571485dd789cd4fc8e9d2b9b/39750170253.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/arotb52n2kgafhp2va0sjrdnna/31046107126.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/52604564070.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/50302929128.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_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 23404 bytes
SHA-256: a3b12b63eb85d3577b0b40220d71835ec9a070101c83c051fd08cfbcb3b585dc
font_02_sfnt_off00012f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F62 16308 bytes
SHA-256: 372a0aaedbd0c944b689016843a4a8b1697c8dddde19bf9bbbc648edcc270d11
font_03_sfnt_off000145a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A6 10732 bytes
SHA-256: be6fe70d62decc8e799f0e6516409d645a7f40f6f77c79510dc0f0bdd23239f8

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