Malicious PDF — malware analysis report

Static analysis result for SHA-256 110ad5245a9a12e8…

MALICIOUS

PDF

122.3 KB Created: 2021-07-17 02:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6261f949350585fa44aefd3983cbeaf6 SHA-1: b68d21121fa0e96de959125f60006646cc9cd0fa SHA-256: 110ad5245a9a12e88687023803c7ea5cf4dd0167a1ee9f4093eb1960d02ac6f7
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this is a link farm designed to direct users to potentially malicious content or for SEO purposes. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608622836893f---42363709390.pdf In PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa3dbd2c5a---saxowonuxaxale.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088daab50f30---migerilebew.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b4b4681a7bff5513429e9b3431054c69/36987411776.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160792d3c6ed7b---kopogekupofaw.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099820c4f6b1---puluzupuf.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/7c7b444a84bfa54eb99c5a47dd39a32a/zurimegibatipavij.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/792148bf416bfc4daa7d7110ce5fa6d6/70334638077.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/sj8omrfkf345lddo7u831ttpj4/87354988983.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072304c7e974---vudovilub.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/kifisujof.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/52326433576.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/86919132548.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b7df8ac34f704d45f83959644a0ebb8b/88685673709.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/wibezivijij.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/67477587921.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4374b61dbb2682ed6bd64fb430cbdd99/najigelano.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/461518b666a3f9d4a2982b7a1944fd92/gomajovizalifafojufexemu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/2e6ee7ca110706f5c3bb58ed417dc4aa/fazowawatadimubodul.pdfIn PDF document text
    • https://airbays.com/userfiles/file/rimokupimugojarumivibos.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b6740e523---34473259209.pdfIn PDF document text
    • http://championsview.net/userimages/pubifizogunukazej.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/244541644a0e8b4e662b78fd3a9d08e0/71920034727.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d8789679---1160626277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=short+skirts+in+carsPDF 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_off000178bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000190d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190D3 10316 bytes
SHA-256: 5916c0dd10098d71aec7b2f095dea4cfb379de668e1d9466ea784e7a5afb0241
font_02_sfnt_off0001a807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A807 20272 bytes
SHA-256: 365106725d0883e74e46cf5d3ab7e5957ba5b881c60cbd334b030eac24811dc9

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