Malicious PDF — malware analysis report

Static analysis result for SHA-256 f671b061e4ceec99…

MALICIOUS

PDF

86.0 KB Created: 2021-07-02 12:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 744fd720289aed10a8f63f1f2e46716a SHA-1: 2b52744bfdb51977ce9b1478bd798af1ed63ab63 SHA-256: f671b061e4ceec9913b8a132705387009588bc24e7ba64a047d08e0cb3b79dc3
96 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or distribute further malicious content through these compromised hosts. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/pmqhqp4g3eoc1gobl7laarcl18/70195515919.pdf In PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/92236647205.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf523ea8e---xiwafepibowezapa.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e306bb2aff---50986517918.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/vuzimetazono.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdb1a49cc9---18758260846.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/tagekivo.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/bumuvugusojof.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/litutoxuluxi.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/biwitisawolalupekaguwi.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/kefutesowumawona.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/5p09nnjbc3vh5qfagkkmq9atf3/65431004978.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/laxazakipijupig.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/kavogorobewinotalegomasep.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cc49b2d78---51693163882.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bba04676cb4---90300472167.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b08bc2146b5---2159723511.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b652bf38ee7---zokedajino.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///79339039693.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/pisenire.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1946c2ce55---8693617075.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/zexawawujog.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0l9966fgqmm8i13v2cr04uo4g8/7122165446.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/xogezedoxutirofunubu.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/komewagepojugosonoxeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=headache+on+side+of+templePDF 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_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 10776 bytes
SHA-256: afcad2bf8ef8cdf87d844a6aacdae30bfc3c275545113ba6a6d9cc5655d8b6d0
font_01_sfnt_off0001093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001214f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214F 16220 bytes
SHA-256: 25af713a8aafc745ecceb2d592cd6d4d2fc5639d22d131107d9ea4d1213e54d6