Malicious PDF — malware analysis report

Static analysis result for SHA-256 798f74c15d5336e6…

MALICIOUS

PDF

87.5 KB Created: 2021-07-19 12:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0808b8f6103ab541a48e13db40117086 SHA-1: 9acf8b2e1ab8a02de1e1cae3789fb4866daf5883 SHA-256: 798f74c15d5336e68e30e22a230a542478bac631260d5ce205cfd56e09fc2057
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs are likely used to distribute further malicious content or for SEO poisoning, making it a potential spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086146267b4e---42435183426.pdf In PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/4e427bcf8e6b2271a14e8d79da8ea886/lumagapixozafujok.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/dijotisikemutup.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/2cb83d8ac53a2be9dcfb5f6197983a56/12654820419.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/61933389792.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/lflcep26m83ichgbihm9jvh2ge/medudelovaralubuzamozes.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa36f3843---korudovaman.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/16914660022.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/wutarubimatometoxonop.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/28711515398.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/ae56301656f1a31f6f925f64a167d362/gijebapokuxenobez.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/e1cac857359873a0e409b1a489cbfc20/70631309676.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/ralenipurob.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/lirufusazotojotixir.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad9ac4f46d---kamopotosavidumotiw.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/83895819684.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/d4654831a356577e60bac4468505ce6b/30498932648.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/ffa16d9734b2b470cb4c18ab62de8f22/dorakaran.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b2ac2a7454c8e5e856e74254342512f6/kewowuson.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080317a219da---lupofakuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=songs+by+willie+dixonPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/tenagojetej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 17248 bytes
SHA-256: 2a98a415871a880169dac4f3b85094fdafa43415eb8a6065ad5e565d6d1fe23f
font_01_sfnt_off000120d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D5 10580 bytes
SHA-256: 5f26a9cf71cd50d3e7ec1233910b6b7169ec22fe9d1634402c40434a1ae79cf4
font_02_sfnt_off000138ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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