Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb6772912a5120c…

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 21:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b5f169d2eae90e83a1a1aff708f9d990 SHA-1: 3d1053db4ed87cf1a74510ec3f02f28fe7bdf241 SHA-256: deb6772912a5120c30eacbdd221228b8ae05fa4794a8ee7565616d434bcc3968
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=3d+live+wallpapers+for+desktop+hd+free+download+for+pc PDF link annotation
    • https://gotoko.com/cmsv2/upload/files/83041460204.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/gufanomefonexepodegu.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/gowenapixin.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/96649094093.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/12605551127.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/pokujikapijozasijunu.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/75036799072.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/11997725643.pdfIn PDF document text
    • https://alpinashop.bg/files/56690775088.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/xowamiwitike.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/cb89ead01d0ff889a323b25dc82f6a74/5731623175.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/24908983750.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce1ad2ca07---vefuzozapitifoj.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/fefatataro.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/18564642159.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/66316750246.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/wizirup.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/lofubeporojoboluji.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d17e64810c9752eec92419d37773b0b1/57008275695.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/lanuluvapizumixet.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16134c21c05683---vojitirisa.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/nugabazaxobimar.pdfIn PDF document text
    • http://geasit.it/userfiles/files/tujawadulugubepimanuju.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_off0000c877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC877 16948 bytes
SHA-256: 981dfd6d9168d2ff17bb1c31c596c3b845f08dadbf32bb2664c03f33802a3ed3
font_01_sfnt_off0000f488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 11036 bytes
SHA-256: 6c5ae4ef3a49d3db41a159364a7dd8385ae8e93b0e0d1ac21f25f50f25277e78

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