Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1161a17a6e70ad4…

MALICIOUS

PDF

83.2 KB Created: 2021-08-23 10:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 916bb9f5c608611d20701b41e3b7c68b SHA-1: 896f2ab580bf33cb5720ab8f91aac2d03ea54070 SHA-256: e1161a17a6e70ad4c9d5c75a5bef42a37fa726034a0442ae45e6e0b370aef9a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The embedded URLs, such as 'https://pistant.ru/uplcv?utm_term=harry+potter+and+the+half+blood+prince+full+movie+english', are designed to trick users into clicking by mimicking search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pistant.ru/uplcv?utm_term=harry+potter+and+the+half+blood+prince+full+movie+english PDF link annotation
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/14613109859.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/rasoxivo.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f33e4d2d41---81448794046.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/pokaredux.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3f4ce73d2cec2ea7f3f55ede6d54acf9/bifotigajikemo.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00096a48c0---6923826787.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bae514e3278---75357791864.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/godinidosuxemu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gnkg8ci2harng27badqpt7s8k6/33479168725.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/gutariwadojajewijiko.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/nfrsjc0a96q5kkmk5d8rjpv1v3/1397338315.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/xubufe.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a0489b7e2ad---rumiwereluxosapuzuse.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202107211844039335.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/308747fe79f673ee78c0df919d7c1fb9/7746398551.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/baresevutopekidoliparitu.pdfIn PDF document text
    • http://firegallery.ru/img/upload/20118574860.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/fumukebepu.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7045b665df---vozixid.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1628533960.pdfIn PDF document text
    • https://iaetindia.com/ckfinder/userfiles/files/sedita.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/tilojudurufowaj.pdfIn PDF document text
    • https://profesa.net/userFilesfile/lirona.pdfIn PDF document text
    • http://capri.lt/userfiles/files/subudosuler.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db3cdddff9---tisolojimofokanopanenat.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_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 11476 bytes
SHA-256: 954a5897e112b85993d9d390cc7d9551607f34ecc607c3db42821b23d6baa7f0
font_01_sfnt_off0000f902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 17256 bytes
SHA-256: 37bbbb0d465449d62263267a6f3f6f90da52ab5cb8a5df274bf14ac7fa87051e
font_02_sfnt_off00012626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1