Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d7479e5876bbfd…

MALICIOUS

PDF

70.5 KB Created: 2021-09-24 18:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4229368b4aa718715dcd2e1addf6b31d SHA-1: db4807233f4c0ae4f9483e8998052e452de5c635 SHA-256: d4d7479e5876bbfd48f7a84530d08ebb389891e4eb14edc6e64eebf3f06de852
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded JavaScript and numerous external URIs, some pointing to compromised CMS uploads and link farms, suggests it's designed to redirect users to malicious sites or potentially download further payloads. The 'SE_CALLBACK_LURE' heuristic strongly indicates a callback phishing or tech-support scam pattern, where the user is prompted to call a number for a fake issue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://laborke.ru/uplcv?utm_term=pubg+photo+editing+app+download PDF link annotation
    • http://av-jet.ru/userfiles/file/zotimobodibar.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312e1334390---nebagikaw.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/m508kt4d8h5724fed4crgaaji6/26791400842.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/tupuzifitotezo.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/porovikopuxi.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/57533767553.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/xetekeropojoremure.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/44534354878.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/wofetuzexuf.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/bufil.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210902_DE4BCE7EB9F29CA5.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/64604143033.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/xolokajelutarobe.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/tobafujodusogupededotej.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/kodaxutaxonidixo.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/82768904900.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210906133437.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/39531191918.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///18586264438.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/rovudotuzaxupovumumif.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/40b23128ff957358c6b974b05690e7b6/43340717367.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/60701674652.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5ed6398f---79206472686.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210919_573584213336BA96.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_off0000b2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BC 10728 bytes
SHA-256: 6b7ce9d6c09a138bef491e314626bae9c710eafec9b2ed4f7fe98bd61c906d80
font_01_sfnt_off0000caeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 15432 bytes
SHA-256: 86c00763bc4b92f0b741337f873c635f418cbf25687b00553b1e186b6712d015

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