Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b69e1c8ee64ecbd…

MALICIOUS

PDF

100.8 KB Created: 2021-07-28 05:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9603ee9aed4f7b6a47706ebd0124a70d SHA-1: 720a326b522de3031f77345cf438d97373e5aaec SHA-256: 3b69e1c8ee64ecbd07920988ab6e4f2130d75f18b051325f55294bb2ece6ffc8
156 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to compromised WordPress sites or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or directing users to malicious content. No scripts were extracted, but the extensive URL usage suggests an attempt to exploit users through external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 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://akita-inu.lv/www/files/files/83351001804.pdf In PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/gomujuzegoralidul.pdfIn PDF document text
    • http://atek-ent.com/upload/file/pebaki.pdfIn PDF document text
    • https://t2sc.me/userfiles/64541643848.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/gaxogasus.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/fekepajupuvow.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/bomumosezulutedovisexewir.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/jomezutufodarenumaj.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/32352538765.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c1575ae7d8a08890da53ad6cd0ce40ac/14343390622.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/62189355353.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a0d735ea7---31000081557.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/67737883728.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5a2078c6dd7b83f610bc193d08877ae7/gekikitoriwuka.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/744e9ca217f08dcdaa07dc337ff58ab2/zapozubelow.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/84kal4o4nouo6brje94643e716/metedovisawajadome.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/70878836847.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f72e21df01a182689a7ed518d7634671/liwofuwelorupenukebalabo.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77ca263c88---35755576611.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/455fc9de5c8cd9990867ab2dae36aede/tulaxuluvenuxawe.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/13283563605.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c5ba4effe---69266949354.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/fbb69434af03f84f8d7636a8c9a449d5/15918341356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=vector+analysis+by+zr+bhatti+pdf+notes+chapter+1PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D7 11052 bytes
SHA-256: aa2f23288a057e08533f632ee760114a797d26bfae8923a605eaed5a93139284
font_01_sfnt_off00012264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12264 19672 bytes
SHA-256: 7a12c96bd5cd271de90c65cbda03d6364b6bd7a7ccf1c5c0278ad9098bdbb750
font_02_sfnt_off0001573b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1573B 16136 bytes
SHA-256: 9964efa23e29908f10efccca0ffdbfbb42a2d79c2e391b1ece9cd5a533b03cf9
font_03_sfnt_off00016cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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