Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2361f907e154f5…

MALICIOUS

PDF

86.7 KB Created: 2021-09-04 09:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ee7b789041a7d450e12371aeebfc769a SHA-1: b6bc395f6e920bfcc9160588b5871af00609d460 SHA-256: fd2361f907e154f56714e06fd66d1a25db096c3426a080c02702ce5a4e73f7c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://smidgel.ru/uplcv?utm_term=cervical+arthritis+exercises+pdf PDF link annotation
    • https://ladulceseguros.ar/noticias/fckeditor/file/56107798500.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/25703cd500315517f1bf503702dbc711/96439508721.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c015e24ad278ce62e97c4d8b06324949/30169551139.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/c14cc2e34d51992d1bed23d99e4375db/fojafabuzadedukukunizeka.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/xubomupojox.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/29087897322.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/tedodu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac99eb2631---73347534371.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/redenavotaduretagemonepaf.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ft41em7jkiunokb9dksoceo8u5/sokolozuvinudaropagojaka.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/2f51fec688e47ff632671a638bbb9e70/22080121869.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/nuwazovalizerogidubukudim.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/63053062300.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/xurot.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/67655922060.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe1652de2---67909101537.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/zovanazegokunokijadevara.pdfIn PDF document text
    • https://fasaac.org/temp//files/45635745044.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/gomunijadez.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160afbfa03b858---64006681428.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/lobujenedatarowa.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/86136435439.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/26986947120.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/zafitafulazopefe.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/9015775087.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf71b92383---jubigu.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/tepajefid.pdfIn PDF document text
    • 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_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 10692 bytes
SHA-256: 5eaac92a110357c0c0bdde8c6a19e2f3c4b1783ac5bedda79f337faf5129b310
font_01_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 17928 bytes
SHA-256: 2f0154788c0a1381b6641191bc62b210ee0c1e986a9e8a1dfdb3b07b075857e4
font_02_sfnt_off00013479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1