Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf7d99bdd1187c3…

MALICIOUS

PDF

71.3 KB Created: 2021-09-05 05:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2cd9dfb7b0ee7301176d00e88599adf1 SHA-1: e799dad18d56822338c8d6e0d236c54659770fdb SHA-256: adf7d99bdd1187c32322398a5f7fe918246f97ec8e1370f35b43512940520473
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely attempting to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://floridahouselottery.com/test/userfiles/file/ferabukejeke.pdf In PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/k9551plhq9hr4s5bjv4sac4pu1/81656212594.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210828061737.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/4e7fca190219eda7967a29c3d4bc1034/korepi.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074ad68587d8---77324742426.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/zutofaroz.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/kizib.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/429a221bdbb90e5ac375f8013e43fb9c/65433100158.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/latisujefilirezagin.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a653ea0a4a0---91675283795.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102eb6659de8---nojodof.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/bemiratapojekijirud.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086b03b0c582---24769987821.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/86470184019.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/45356148169.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b9463d68dc0---pewivebovozazokazozijaj.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/zorabumiwovekokoputukuded.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/32361044458.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/82476042202.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717b35314d4---50778856980.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/40a529193a639afcca129d6d8895c02f/geradudozugudegi.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a56b9624834---xupojux.pdfIn PDF document text
    • https://mytopics.it/uploads/file/kebezibegalezup.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/rexupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+view+manual+journal+entries+in+quickbooksPDF 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_off0000b98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98F 14420 bytes
SHA-256: 95a7a656006a972ad99f44330b177d95dca8e6c79c9cb4484e1013a1cf25b6f2
font_01_sfnt_off0000dd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 11140 bytes
SHA-256: 63da23279b2bc06b8831b6151ff1efe1f8b702ec7dd6bb2503d924628d57fc5b