Malicious PDF — malware analysis report

Static analysis result for SHA-256 393d62731553f743…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 07:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 47ec43d939d594627fa88ff0d9343a00 SHA-1: 5161f5898584de41d1c2fba1f05a09ab2d013427 SHA-256: 393d62731553f743d09612770940cd802c655879a6a8d1eef5e0380d641eaee2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely related to T1566.001 (Spearphishing Attachment) as the initial vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=quantitative+methods+for+business+11th+edition+solution+manual+free PDF link annotation
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3gk9nit39qupt473vserq1ul57/pasizakamabasaxowakufig.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/25u5eu8bg3nn13a056uie10ej5/44459123714.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/9062346235.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/qak6audnb4kolns2edgs75pbt6/xitalusejobodinidax.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a0728a5e2---pexopuwom.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/jawodojekidisapojus.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fdde408b1---58630130339.pdfIn PDF document text
    • http://kunbot.com/upload/files/98102103879.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/2d29752267b86ea69c59a261015a4716/69583595219.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/pativovisujisexunanejozu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5138d5b42acd87ac79058cc349f03813/retebinisebixekafixog.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16088495421c05---gotositagubajinavikowur.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/35837985940.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/zikivisosalibasenojiraf.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/tofinosojotap.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/92803101601.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/4f4e8f0383c1dc834e4633b7416afe0e/dodugoz.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a64362d81f7---bagaridakusulutugepoled.pdfIn PDF document text
    • http://gojjang.com/uploads/files/bupusojifamof.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc72c255bb8---risaf.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/38d5f427ebb4e982cd1bb4cd7df7f65d/85683661737.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/rovovilenedodamotevi.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/84868932445.pdfIn PDF document text
    • http://ymmicro.com/files/files/43328630439.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_off0000cbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCE 17720 bytes
SHA-256: 2690a05a78ea53a7da8ecd927fe2200dc31836fa049a01bba33e171a3d483ce7
font_01_sfnt_off0000f97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 11036 bytes
SHA-256: d62ba4769813c1b25ad7847a891171d5fc5729efcc938238b71e71e47abf0ce4
font_02_sfnt_off00011313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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