Malicious PDF — malware analysis report

Static analysis result for SHA-256 712af488f55e50c1…

MALICIOUS

PDF

79.4 KB Created: 2021-09-15 06:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bac6bb1e7d4404c6841da03f75beb5ec SHA-1: 78d6f55f786e8b636e20897e46664876eae26052 SHA-256: 712af488f55e50c12a51fdd8712224d248b0e172a4985a712850fdd74a26636a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=exploration+lite+full+version+apk PDF link annotation
    • http://ameshamagazine.com/js/upload/files/jefuwokisofuvobanat.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/kizulegevubunapaxudoxivux.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/najokarozuxafozaxefu.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/mivubitaxipafibunovutunu.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b739308afb---rifixijavaxuzowab.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/dc0ed7f88a6b5a5979978b611b781ec8/jeduwajal.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161410e2b9f71a---10006211578.pdfIn PDF document text
    • http://npas.ru/pic/file/zasomotosazaluzunaxu.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/5249989938.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/zexopunemene.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/lelugujufow.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/kubolujubikafixamatol.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/gekawig.pdfIn PDF document text
    • https://linardi.ru/files/file/43781747780.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/jazemolazujanodapu.pdfIn PDF document text
    • https://nomortiga.com/contents/files/lekuzi.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/14228597101.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f97c0902ca---gasavugipiguxod.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/kazuje.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16131f39abcc19---29513401875.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/32241373449.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/66396993622.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/vuwitak.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/34090613478.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/wokituvoxet.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_off0000d139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD139 17356 bytes
SHA-256: 8743a593b685ef1844afc855ed11f84a655eec4e52022b2b787ececb5ffcccae
font_01_sfnt_off0000fe7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 10696 bytes
SHA-256: 20d2e8263797846393ee7745fa8f77649dfdd3645f378dac87be0170ad3be134
font_02_sfnt_off00011734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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