Malicious PDF — malware analysis report

Static analysis result for SHA-256 6303aa30eb7f873c…

MALICIOUS

PDF

88.6 KB Created: 2021-09-03 10:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3b38ca35c879f61f401f7a42e77bb1f SHA-1: 82e2412cb2e5b8d4e370f3c298648b685c324ee2 SHA-256: 6303aa30eb7f873ceea849f015548df48fa58222c408ca62390756a3a57855cc
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external links and the high confidence detection indicate a malicious intent, likely to facilitate phishing or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=present+tense+verb+pdf PDF link annotation
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/90511781813.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/144786e378c3b1273bbb255b36f4ef22/67163221621.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608444e9acf6c---peziguwedefamizazuve.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/25151057884.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bde1ee6fe0---zapamezopunemuzu.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/fanopusewubefaw.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/67952044634.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160befc3fedc86---98606280585.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161147d8695dc4---suzurotu.pdfIn PDF document text
    • https://o-dance.com/upload/files/buzabopagobosajik.pdfIn PDF document text
    • http://netflor.pl/upload/File/36742544461.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/zetukiwozi.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/e3c8747c88f837d2bf631ff2d18cae3a/66729276562.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210605_48DE7355A52EECC3.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/93133987138.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/xivurosotonibe.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/wunofifevom.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/59858569005.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/99190752450.pdfIn PDF document text
    • http://brukbet.com/user_images/file/juzitutaxe.pdfIn PDF document text
    • http://vtaky.sk/media/file/forufipo.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/runurulobogatovajofikagen.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/zexedabasiwibudakogesa.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_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 10276 bytes
SHA-256: 3a17b06a5e62fd62c54e89bbd1cb5babf1c6715d5823476120b634ddbc676712
font_01_sfnt_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 18636 bytes
SHA-256: 430f5bc0c3d8a42f40f52759cc0ce1bdfe498cd805c0252d0c2a3c676efe7b60
font_02_sfnt_off00013ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.