Malicious PDF — malware analysis report

Static analysis result for SHA-256 7211bedaed230b91…

MALICIOUS

PDF

76.2 KB Created: 2021-09-03 18:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f17f4476e464a48ed439ba9ac49e2788 SHA-1: 7cfa9d3079743aa2a275eb32fa3bdf9bac264ab7 SHA-256: 7211bedaed230b91897f14eb0a1a0238429d67b4b0e10b6b3ca38614c1dc70aa
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to exploit user interaction via embedded URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6660

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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=english+for+business+communication+workbook+pdf PDF link annotation
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/xilitisujiwijixot.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16119ad8e1c6f8---35280439789.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/37678862994.pdfIn PDF document text
    • http://jar-ted.pl/file/4249463269.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/wobejukubiku.pdfIn PDF document text
    • http://congtyvima.com/images/Download/bumutotedos.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/22230348757.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/lokewunaxidezuvexelisabo.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e83ca41016c---lukoxojonulodavawuli.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/2970581894.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3a25938a5---56545488434.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/xigobanirasenoverusojibip.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c2a8c31770---rubupulosul.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16078e947f147c---wefosupodijefe.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f12a6639f---xovegowivinuwiwuja.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/8a3ccaf18d885fh10vkjjohun9/29694266219.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/79549591883.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/81885963233.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/03f541e16fd496836c605bdb0120d88f/wopewezerarowemiwi.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfc574bbcd---55218168966.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/p63bfo5mfcddihjjel71b4f46s/11082736783.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/07/03/48788767788.pdfIn PDF document text
    • https://artbynela.com/uploads/file/65207838165.pdfIn 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_off0000d7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EC 16640 bytes
SHA-256: 3a7e9c916299da5492a9ddd437769291197f75edfcf20d63f53f8fbfef31f181
font_01_sfnt_off00010288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10288 11468 bytes
SHA-256: bf817265883d54390612d4632f2b32a2398a385345b90c268e01d36d8e56bccc
font_02_sfnt_off00011d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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