Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32e6121d09b951d…

MALICIOUS

PDF

78.0 KB Created: 2021-09-11 14:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 703449d11e2653eeec3c57c92d105598 SHA-1: 82c985498694db9332ed4b913a7aa29689f7c40c SHA-256: b32e6121d09b951d1213be5f61edfc7ea22dfb5db33a5007f2e108621b168b54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's primary purpose is to act as a link farm, likely to distribute phishing content or malware. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://dp-silver.com/userfiles/file/bagazalatozozuwojujileki.pdf In PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/60476154007.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/85737748323.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/5468001925.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/81432657820.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/jofedajoj.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/25084083874.pdfIn PDF document text
    • http://agrion.org/upload/fichier/gidefusosovono.pdfIn PDF document text
    • http://contelex.it/userfiles/files/pidazuzoraje.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16134a2ec99c52---kibiteromanaxopigasaje.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/xofik.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/fcdf9d39d34bff7339e6b82b2aa29633/zazobutonatiruk.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613425846c4db---72690630328.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/mumeforaki.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613879ce30a3a---59440657138.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/17700523592.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83908082529.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/mewumutepos.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/66955105470.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/zuzafusegugitozidinamijub.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/dalerinoguvizefer.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/26573723473.pdfIn PDF document text
    • http://cycling-software.com/files/file/19351836979.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/88497636977.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/33089922143.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613826784f7b6---86167414147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pokemon+moemon+gbaPDF 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_off0000ca0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 18856 bytes
SHA-256: 5076e7470cb8654b6d27faab192a9c50a0bdb41966d3f105cd6a1bc9eb04c559
font_02_sfnt_off000113d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D7 10180 bytes
SHA-256: b78dea9a2ea707027b2965c63faec67c9ec5e6e3383eb2e9ff1f396fba7e6a9b