Malicious PDF — malware analysis report

Static analysis result for SHA-256 800be8cc43c1c643…

MALICIOUS

PDF

90.5 KB Created: 2021-07-01 14:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7caa18081a9117c102e5b7fc5650119e SHA-1: 6f17fa426dcfab7b2f6c5e3e4de80852e45c6fd9 SHA-256: 800be8cc43c1c6437175cf3eed35791e5f2e1b2d39c49f3597068a9473537319
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://inwebjor.ru/uplcv?utm_term=pick+up+lines+from+the+office PDF link annotation
    • http://vilocom.net/webroot/img/files/20152240118.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/t60jqfn5php79udhiq2spmurpa/59913599553.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/gc8c39687kr9rk7rjr18mmmisb/rusufu.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6ede0af73---vexurerokasipixosux.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/b1f57a082ea179e33abbcaa5c92028ff/zirenurubenadadexiz.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/gifepuze.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607df580bf814---79718886289.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079d23d9255b---xepexifawuf.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c344296c9afb4ce15279c65959301798/69588724674.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/c64m5vg7h2e03cscnl7semhrbk/meniwegupadukaviza.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d21fd833db---pubapalinenituwu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a563e73a0c6---kudetelibisabag.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b09cb21f241---xunozepaxapoj.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/e09ff9ea56243792ead30ab8e4533280/dajifobatugojutuna.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/17ba65bf2b7df51e2861405199fc7dfa/jofilerixapojitavitizob.pdfIn PDF document text
    • http://skomi.ru/img/files/file/bupujuxavewizomesenodep.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/pokodofatumabibadikapele.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/xugupurakimat.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dee003293---9378533822.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/xipumulonatagovuxokivuwuk.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adc1e0df8b6---nuxuwepejifekeganutanil.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/lufuwofodafuzi.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/31668526419.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 10776 bytes
SHA-256: b333020eb37ee40e802b71f7c5e3a086a51b88492acbaf88530fa6bc675abf24
font_01_sfnt_off000117dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DD 17272 bytes
SHA-256: 420a40cd20f4b9321064a856771cf19d8a95425ef4a97506c49d3ff2e508d559
font_02_sfnt_off000144ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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