Malicious PDF — malware analysis report

Static analysis result for SHA-256 a630b6300587fe3f…

MALICIOUS

PDF

76.0 KB Created: 2021-10-01 18:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d1f20601658ffa92080c40ec96f8ce26 SHA-1: 76cc5a9872852581ab5f28064e1a38b0e51e72c3 SHA-256: a630b6300587fe3f772516d16a0b7c2bffb00e1fc6953b88c7009a594e3bec83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure indicate an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=justice+society+full+movie PDF link annotation
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/8323eb343bda3138d99dbdaa4a9fcd37/96275530924.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/32606910670.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/kekukutevewugosowakew.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/nibitufatoza.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16130191a9fb71---renot.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/50573245604.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2a36e239b---71846724525.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109160929224738.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/27312211136.pdfIn PDF document text
    • https://senegal4d.com/contents/files/dekisodep.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/bavujepiw.pdfIn PDF document text
    • http://adice-area.com/pictures/files/30557626601.pdfIn PDF document text
    • http://fotossc.pl/_files/file/34434702336.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc6760015d---wigirabagajovoz.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/43093077354.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/97653521847.pdfIn PDF document text
    • http://sciattella.net/images/file/61669128247.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/39tqj7e416q08l4efg5rln99rf/wanidifa.pdfIn PDF document text
    • http://erfanekeshmiri.ir/userfiles/file/32593103293.pdfIn PDF document text
    • https://advik.net/userfiles/file/30219838220.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/58945153274.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16144095b5297a---neraneme.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/rudafifubojamumunogaz.pdfIn PDF document text
    • http://popmetre.com/news/files/71347204546.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/75751572459.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_off0000bce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F5 21208 bytes
SHA-256: 70bdb91c723a1b65b24056b4c53201ea7a7996d5b3e87162e4fbe7b30931ee74
font_02_sfnt_off00010aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 10400 bytes
SHA-256: a048c06b54c0bc935444f8b0d5a313d5a9a76f46f858a2d7ce3e69a47778355e

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