Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bd51c42d7b3173…

MALICIOUS

PDF

87.2 KB Created: 2021-06-29 14:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a3f71a69f715d2c5fea0a849c40b1b2 SHA-1: e2f34f1fda308ba18196ea868ac6f0a127f679f3 SHA-256: c0bd51c42d7b31738f0ed5c72129e56053e2aa3ef454db14ae78081ead2a56a4
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the PDF's nature as a link farm is clear.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/db537a0fe8d8d18f392fdadfa523bff6/koxerexavasumomavugub.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/ljccf4nigu5pjvnri72i91dl26/linikogoparaxogolulaxepob.pdf
    • http://jirehenl.com/userfiles/file/082007425198.pdf
    • http://annassteen.com/ckfinder/userfiles/files/berovugezami.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f59ee4f1b0ca98d47f2758583c64a997/79773684797.pdf
    • http://chalappuram.com/userfiles/file/xujuzijis.pdf
    • https://mariellatriolo.it/public/file/3948182798.pdf
    • http://greece-ex.com/wisirixudatomimudo.pdf
    • http://kamnitikamini.si/upload/files/vuguxexekabutipijuzajul.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/89557d53df3baeb2b8da24b9e8c718e5/29929225376.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608130bf80b61---buxexifagedogerabilolele.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16086e71cccbff---pegogawiri.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16087835d0ef47---xuletizimok.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc91841842---pesovenerup.pdf
    • http://dzbnf.com/upload/file///tafowutewimijizul.pdf
    • http://www.tomasjelinek.com/img/pub/file/fekakovopofe.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d58eb8bbb84427b5909e7ddda4d49c72/57094218998.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607abd021cbb0---89177614585.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=run+for+the+wild+2021
    • 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_off0000f2da.bin
7aa7c1554efdcd8405c0fde0def682bf5d0ac68fe921183b857dbe0ddd8a273b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 17128 bytes
font_01_sfnt_off00011f97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F97 16792 bytes
font_02_sfnt_off000137ae.bin
f2760495f6a4e9487c43f043c3c896352ea33e624dd9770227301e731975674f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137AE 10648 bytes

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