Malicious PDF — malware analysis report

Static analysis result for SHA-256 768b771e60a24d7e…

MALICIOUS

PDF

86.2 KB Created: 2021-08-01 12:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd4bd766db8364ea4edbd74815b6191f SHA-1: d0dc2fff94ac80ecb24b237e1040d61cc8eded15 SHA-256: 768b771e60a24d7ef37271eb0663502a9d9e26536efd52e4778c891d015d8887
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting and pointing to compromised CMS uploads. No scripts were extracted, but the structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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 http://simonhoirup.dk/userfiles/file/zasubodujejododosuvut.pdf In PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/47503341303.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/vofm9k7o4rcuuejunphbjr9r0i/9077469459.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/30001539282.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0dfab2c7---riguropag.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/mexozofoxowomore.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/xupubusatitodot.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/mijuwa.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24c115c16f---88694398610.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/ae8afb6cf507e3a1b821a63b144cf064/73396672321.pdfIn PDF document text
    • http://exantusfamilyreunion.com/clients/9/96/968554593547eb574606130639276270/File/87923053617.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/398fdf2b4f12c5093e45982e420c8e7c/67369087110.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607becc47c461---68719130142.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/sekerifarevekolepubakapu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f390fad6d05---55050141605.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210723105658_1669436915.pdfIn PDF document text
    • https://bdcomunicazione.it/file/fimewusedofeforebuter.pdfIn PDF document text
    • https://superpart.com/files/83556191792.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/da45fb76f476785563ab38686e36f32f/pijexe.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d7ce9e02c---56987243467.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c3dda346b40db93c54c3a6817b817dc1/47320152784.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/73808207572.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/72337865674.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/73400548287.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/10055139808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pimp+novel+iceberg+slimPDF 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_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 10664 bytes
SHA-256: 7e47948c9beb9baaf9a1453007c21680a960a811433b5eb109ee0bf41ca337a0
font_01_sfnt_off000106a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB6 17232 bytes
SHA-256: e91cb539d7a4399996b194237bcd70fab080f6f70e548d6ceb3ec77e76c74473

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