Malicious PDF — malware analysis report

Static analysis result for SHA-256 82304c179a3c4523…

MALICIOUS

PDF

89.2 KB Created: 2021-09-01 19:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f0ee958e11f0126ec21db14f6bff93e SHA-1: 17b57f1704e1e9eb72c4aff9335fca6272cf0f25 SHA-256: 82304c179a3c452323666fd57960e80fb310e71f6baf51e704ff063212ba6ee8
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable domains. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mszukam.pl/dat//file/voterapojibunewiza.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bcdda5147---wakexu.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/mawoxe.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/pajibavoguzizanejekige.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/82bm7qingfiulopufdmgqgncn3/dafupuxelozudoxaline.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210615185504423733.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090eff2cc526---12538154003.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/c95i64b56g20dbru2auddlkm76/59353890928.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/gojoguzufinizozevumorum.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/nudopiwegamobawenufonab.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/er44b9iesaok9n0001rin2ki03/27903760689.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/373525926a920d81d29341d77564771b/tajabob.pdfIn PDF document text
    • http://fullx.net/files/ruvanojo.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210614_E1A852733ED07D8A.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/n9u3k6tjl27903qr5vdopv2t06/keluwade.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084d011c56c6---narebajakuzaresix.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/502fe6d51c7ae897d2c378fca5d2bda4/xumivutakux.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef5bae7067---75693499132.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9863715be8---fobajasojadasiveguwowifu.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/gamipomonuminawujemisit.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/12538046372.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/38280916129.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/63954355100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cellular+respiration+crossword+answer+keyPDF 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_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 10928 bytes
SHA-256: 43faa05781570941005200fcaebe09989b247fd1bcfbd10936bf7d8331dd48fa
font_02_sfnt_off000125ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BA 19136 bytes
SHA-256: c763aafd641ccadae494cdb5d72d660290d2dbc7f5b4910653d30f699d0d88b8

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