Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ce64c932f69fe3…

MALICIOUS

PDF

88.0 KB Created: 2021-07-25 21:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7b41ce0cf18b72b3e646e447ec8fe9d SHA-1: d5670a3b5e00e0e632b50543db945d4c4f086fec SHA-256: 79ce64c932f69fe3105755cb0d84eea4176b522072314fa89418d67bf61e9638
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link farm with numerous URLs pointing to compromised WordPress installations and disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious purposes, and the link farm structure is a common lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/17d1391cde4508f6fc2bb91b99d4d18d/60878242850.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/sp9jn1rcf8tv7h36jsihn9dg34/23441779661.pdf
    • http://dailygiasi.com/uploads/userfiles/file/vobabizobasit.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160db11810dbe5---7451164649.pdf
    • https://hotel-la-licorne.fr/userfiles/file/tuxobopudopofur.pdf
    • http://studiolorenzino.eu/userfiles/files/28411045724.pdf
    • http://barudan.hk/UploadFile/file/20210722133620487.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/21dc03b4a38114ad42e5252b3a2e100e/xezemajexabigamosip.pdf
    • http://palaciodelosnavas.com/userfiles/file/zumipepakes.pdf
    • https://noddy.nu/images/file/dakemapifaw.pdf
    • http://sunarfactory.com/userfiles/files/24434184139.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c052dd92107---vogejirokazivap.pdf
    • https://qpshouse.com/upload/image/file/57842709198.pdf
    • https://fertilizerproductionprocess.com/d/files/pufatedonopus.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/06e11d0u32j4f7mkt6q6p1rfn1/1653194545.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/207fb2e397b8ff6a181f0a3a289581fa/21469751778.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/f115d84cbcf19e590943f3e719de06a7/31038545109.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9e5cfb47---34444588153.pdf
    • http://vencedor.coop/images/admin/file/tobifafep.pdf
    • http://arcenevents.nl/site/upload/files/busafez.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/68f73ec3bd864a8a1cc9b3e03b98c8e6/10092294381.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e9f4c39ff---48348168290.pdf
    • http://timandlor.com/userfiles/file/23693994191.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/1aeaadb34fddb327e9e610c8cd35406c/tawobeledogo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=identifying+simple+compound-complex+and+compound-complex+sentences+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 16792 bytes
font_01_sfnt_off0001048d.bin
33a7d0dfc4bb1dbf9bb50610f1a5128d09f1260e8c68e4b7df03e4167c99b1ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x1048D 19692 bytes
font_02_sfnt_off0001364b.bin
338010beeddd1eff5a4099783e740b87646c45de33241b40f8a1829e903bc1e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1364B 11544 bytes