Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f8dc94ede8f502…

MALICIOUS

PDF

210.8 KB Created: 2021-06-13 20:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c191d78df529b14aae1739ace67f5d1f SHA-1: 7949a3062855645ddf0b4ba0b16fd1ed3e18f40b SHA-256: f6f8dc94ede8f5024b41c3d4c2ee74f9a5d4710a0d5b8cc1fb2ad39c3c33cb06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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.
  • 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=best+chudai+best+chudai PDF link annotation
    • http://gloucesterclassof81.com/clients/23558/File/81107108271.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa67cf6f0a0---65661477298.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608219ed6e5e0---73792189525.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/fevamawigavizaduzajuxabop.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c851ae9747cea3398568020c82f590a9/kupalibivivinunorozupafus.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/39649f37fd85e1a0b50381ef476d80d6/83640510872.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/441c3940b2390f1e9b87a7d07e92da9a/zofojotuludevi.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bec457ecd0---tegowadilatuxobetuvuve.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908b4d5c294---gakomewegadumuraxa.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a00b00cc2---49819761290.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/nic2p3mqmddu153i2jn5msmjt1/56074483695.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/63f5a520a2a9b7e3adee18c4c94885b1/39352819811.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608a55e2468d0---kefif.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3823df3d1a---13988090999.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56bc75503---67884018267.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/ceabfbb3831e157f5ecef6004bb5825b/49430466704.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/48884501167.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794ec830a65---dosorap.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a287df9fe---87746465294.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3075C 5088 bytes
SHA-256: bb731e126e3c1bbf7a9d72663986504660968299d9a9d9eb6f6dca072a071df0
font_01_sfnt_off000318a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x318A7 10916 bytes
SHA-256: f8ccfd7f4688a1ebe0cd0dd837baaf2ea05736771c7e9c2d4447a30808858ca0