Malicious PDF — malware analysis report

Static analysis result for SHA-256 670c75b4e479ac08…

MALICIOUS

PDF

87.6 KB Created: 2021-06-26 15:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 93c504df5deca5c6dc594111ed5354fe SHA-1: 23d898bfc206445f49330192ef6031113750e343 SHA-256: 670c75b4e479ac08e24d1b48c40ec5d092d050b5369af79af29d74f46b0b3664
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded URLs suggest a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160726ab8f3de6---46465854628.pdf In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098fa760306d---10868031573.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a6cc8df3---jojefejag.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/pnv11nrqghv30lha2jmfmccja3/50273968397.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160859e807fa5e---kiwowijasuwij.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160807a18a03f9---ganelototak.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/pugubitoxewavatawane.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160816f8028d50---32273929691.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/84286538473.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/21059174058.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/bitimagunuk.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/f5ee1ccde7skg52k4gr48mbms6/kogudepasirujudulokul.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d514d42656---40552857342.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/bbeddbd9cf1ba3b6dc4ad5eef5c046de/nifavuraxevud.pdfIn PDF document text
    • http://prosquash.by/data/8989803810.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a01d69864b---wilurizorakiloda.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/dfa63f874e8139879187e9ca9b115e95/mizoguzuxasepoli.pdfIn PDF document text
    • https://aokman-drive.com/d/files/rabirefesakepozapesufikew.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/322f2e884324cb9fdd8a8dc2e98d052c/43830651181.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160769889d662a---budazumiwovojuworojosep.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160aa17a615d22---depejaxixu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd46f0cf1b---gevowisom.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a222050e6d---vomagirixonagepotoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mtg+foundation+course+class+10+maths+pdf+downloadPDF 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_off0000eea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA2 11420 bytes
SHA-256: ac4ebd54f3a4c0f7f9b3f2939fce122918c2f4e2d758a1807f92da24bb01ceb8
font_01_sfnt_off0001094b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094B 17408 bytes
SHA-256: 997588099ebd3b11b2cf8f6c083c726053efe9ccfed65b35cff626f405b7b31b
font_02_sfnt_off000136c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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