Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1a829895698f55…

MALICIOUS

PDF

90.0 KB Created: 2021-08-03 13:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84b04b7c4d516f6fb7ceae4e79254736 SHA-1: 8358a509cdfeea86a43f717683c1512b7ca8ef38 SHA-256: 6f1a829895698f55efc6daacd839bdda13b8c27551157ca3cbd924ee48195dd4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. These sites, in turn, host other PDF files, suggesting a multi-stage attack designed to distribute malware or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=5th+grade+math+word+problems+workbook+pdf PDF link annotation
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160721ed8536f5---16450449267.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f98fdab4f0aee248b6cc69bc65e1622a/64931494427.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/a266ad006c73231978db28559c5a45d7/doxumosojaloxolabi.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/42d4c9295385d5f15499e6a9bd75d402/46533570365.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/bumolowoganamofawemimupeb.pdfIn PDF document text
    • http://princeverma.in/uploads/files/fubixegerewezefubaz.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/japodalojugogu.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/nh3hvh12mm0eimprellvaajpgm/lekula.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/155e58bf7ee9b82ef7cf7bdcc54f3258/67836607905.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/299dfe8f9178790cd4b07298403af488/buganepomoded.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094563762538---16035141940.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/60626751764.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a97a91509eb---93704874902.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/1871923381.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f73fa30f3b4---58723511018.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/16d0cddd0e019123839c4fcf693892ca/5046886118.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0929ec2e22---88167704900.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2c2577f51f567dec7723e03d06b7359d/fekuti.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cc910954d---19658144898.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/mtautukfhbsfu3qdc1m66io8e1/roraguwapunu.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/3ae6844e164d6ecbd1dc98d916604ec7/bemiseniresafurixelo.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/luvetigewufofojoxiroxo.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7c3e0ac27---dudefupumulaset.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/87159347188.pdfIn PDF document text
    • http://join-angel.com/ckfinder/userfiles/files/30317691727.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/44011559294.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/9cd32894d6c2ed8e8d1b082a7b34cd56/62532451953.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_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 17312 bytes
SHA-256: e9c91dba53454dd72792d5760f6986af811af1f300215b6a111f76ba020be221
font_01_sfnt_off00012809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12809 11104 bytes
SHA-256: 836f8599b6800bcbf7c0f0ba7576dd623785b629c0c0f2191336c801143b3f09
font_02_sfnt_off0001419e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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