Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ac21c2a2ff4121…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 04:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d144a37f5fd8e585f381e7126cdf3539 SHA-1: 91841300379b8491bd0a4761ae61e9be63d2e625 SHA-256: 64ac21c2a2ff41216176774717f96a579e372038b90f3a20c009dc8589abd208
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://laborke.ru/uplcv?utm_term=consumer+attitude+towards+online+shopping+and+their+satisfaction PDF link annotation
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/c978084fa1f78f2c872a9f2b3d9b8284/70466242201.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ef2683cddbd8af5061f3d10d41172a59/joxonifoxozazedudob.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946435aa23e---20023867431.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/nilobibisaweliporox.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/zalazebijalerev.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/22680943571.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/jiruropomotugofalobome.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/16652468484.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611bd2c7f2153---vibamudilakokogela.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/32123040912.pdfIn PDF document text
    • https://suksesunited.com/contents//files/nobemikuwipukozunu.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/6553478701.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/6404680815.pdfIn PDF document text
    • http://ceroki.com/image/files/folutonagazebo.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/lewinofaxujaripudatoji.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/rutipamodujojib.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/dafikatobudom.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/92607716849.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/xopemapuniwiloso.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9ec4fd88---gikinefudisurupizixoj.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/79cdb1e909f8dd9683a747cd2edad324/migefamolepoza.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/11170555566.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8E 18144 bytes
SHA-256: b68e374741adf1d0c35a95a74720d53a7c9116626589f157f26ef23ee578475f
font_01_sfnt_off00010d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A0 11284 bytes
SHA-256: 98a86100d238b1ac977a9dc826895e4777d501eba956037cd0a4f5828b6d0fb1

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