Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d17b4f2e5870a2…

MALICIOUS

PDF

93.8 KB Created: 2021-08-15 20:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0302710483095841864ae3bf73b4730b SHA-1: d91a59318ae24b71b36c2f84b263348de5ae2c53 SHA-256: 19d17b4f2e5870a20b0f242cd4ab5f480af4daf32d0dd8ea9ff039e270ccea68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves using the document as a lure to drive traffic to these external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alshaabcoop.com/userfiles/file/baxirazokupis.pdf In PDF document text
    • http://wanyuantemple.tw/userfiles/file/diwejunovofimitosilepekoj.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/43691717281.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607829402549d---21444008852.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/48359bbkpsfmaffddjglv9sd3a/25516024095.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/29145406964.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/javuboronejizosexox.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/94822105931.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f9c522220---rijerugijilad.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/18a68755e6ff1868fb9e2d8a48a16f83/41019870234.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d95418dc11c00d841db73ec20b6cf9b3/linubawiribes.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/gajoxibesebojagasoj.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/zefusedebej.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/23955603404.pdfIn PDF document text
    • http://amandamaitland.com/images/file/33944936765.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/965b9a09d649ba4db92697ba4a7101d9/3795175034.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9dddc0cd2---vupokilalobukod.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b28641838aa34980ab1b1552ed148fa7/fofoximemixud.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075d5e559389---tiwifazivuxasafonogadi.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/46507331751.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/kibad.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/gemugaretogu.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875f5a6bac3---8345900080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ejercicios+resueltos+de+plano+cartesiano+para+secundaria+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 16304 bytes
SHA-256: 72b6d5534888ecec27fd68dccf88827b5fbc3510db23809d90398b76a33fedee
font_01_sfnt_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 18164 bytes
SHA-256: e0d527c0cdac0287f6e86b64a1578fdbee34a2efba2e51f8119059f4962cf92e
font_02_sfnt_off000134b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B9 10828 bytes
SHA-256: 6d8504dc98695817b716d77d1fc7100cad31c565dea1173cd13c7a7251318360
font_03_sfnt_off00014dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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