Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbfc5fd5ce2cead…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 00:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c4a5d45186eafa4811e1694ddb95996a SHA-1: 14a7a2a1b056266b12b8005f341581fa9ad3adf9 SHA-256: 8bbfc5fd5ce2cead875784e4ae2e6c8e05a15d74d97db4f4b4491adff9eb09ce
164 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as a phishing trojan. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the nature of the links and the ML classification indicate a high likelihood of it being used to download and execute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=osu+maps+android PDF link annotation
    • https://angkalaris.com/contents/files/13407470370.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/58efdf394f3a0d5717d62f7fa1018632/7255847829.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/kexanu.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/73940491911.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/zedupur.pdfIn PDF document text
    • http://sdes.in/uploads/50202340132.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161417a38aff00---tezitozedanesup.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/towede.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/54790866843.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e22949c77e---xopuzetumijofo.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/fotofawaxutinaxivux.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/nepufomimu.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/fomuwo.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/3854149438.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021092105044773499.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/84897609426.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/s85cgomc8emunnl3hooo2kh6o5/muvuxijep.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/267da51db6352bfb15e1ea982ce3d003/59457931185.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-07/images/files/71103066938.pdfIn PDF document text
    • http://e-district.org/userfiles/file/borodare.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161443df735f01---3297046522.pdfIn PDF document text
    • http://parfumland.sk/upl/12449915195.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/57890163428.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16148fa82c2ec8---40345090414.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/94994238843.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_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 10400 bytes
SHA-256: 4690a15d0d8bbc4345ef59192618f9817739170848a1f720444cfc809287230f
font_02_sfnt_off0001110c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110C 17884 bytes
SHA-256: ca550686203309024f311612c3cb95d01df76c95a3379882ecb5b612f3634e2d

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