Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fc177548cdc7d8…

MALICIOUS

PDF

81.6 KB Created: 2021-08-26 07:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 252e61b680e69d84fc5da19e74b790df SHA-1: 7de9d71dafeed81142f9327fe0521983381a8172 SHA-256: b5fc177548cdc7d84af5ccdf72692fe04d7d10233ba999b695a29d79e1a478f5
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as 'Pdf.Phishing.Trojan' and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious domains, suggesting it functions as a link farm to distribute further payloads or conduct phishing. The PDF structure itself does not contain readable content, but the heuristics strongly indicate its purpose is to redirect users to external, compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3507148a2aadb3c03fb9f252097f6f8b/31244364858.pdf In PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb6994983b---givoliliwe.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/dusezilekevuroloso.pdfIn PDF document text
    • http://guowangcable.com/d/files/84297112787.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/94982665432.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/cmtdnh1f8hm1s630j87i4alit9/99448107608.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/c5dd08af2cf95b46bc5eb83a75d59c1a/89292048456.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/51223180605.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cdeb56856---nanoti.pdfIn PDF document text
    • https://okvino.it/file/53794728370.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/67489113314.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/77011688381.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d23138b4e5b---3103002435.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/71057992139.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/moburadunasoradadubapu.pdfIn PDF document text
    • http://fedoro.ru/upload/file/20534021711.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b238ac3d4cc---jobakumuzudoradixo.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/71014472029.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/cb544d327b8d7b002d148bbbe55d54c6/49128360268.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608695aaf1d21---juzomozusadojuwugeripos.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b860934fede---90538031678.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/tisufirunupemepazeju.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63212490050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=rs+aggarwal+simple+interest+class+7PDF link annotation
    • 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_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 17240 bytes
SHA-256: d1103a8539585c44042f59594937510fcc78d3668d367d7b4f1eb8f796b301f3
font_01_sfnt_off00010776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 10776 bytes
SHA-256: b2e71cc5cd528d13a20067b4d78be17ad8902286fb90393d24cd3ac56c7cdff5
font_02_sfnt_off0001205b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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