Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8876938e7198be…

MALICIOUS

PDF

78.5 KB Created: 2021-09-05 06:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b038c54ed54cbc1bc05dbb7ec2e0c310 SHA-1: 63972154da3361315bc2176aa47216805f7e8ba1 SHA-256: cd8876938e7198bed778cba1dffd263912f6b4321200b5d818e40318da212a5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=s%C5%82ownik+tematyczny+angielski+pons+pdf PDF link annotation
    • http://csc0451.com/userfiles/file/20210623124407_ggwl3k.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609f545c34ca8---31457933391.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/tewisowiwuderutuxenugif.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9279b11d66---28953205767.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/68494269593.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/76867651591.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/10311599039.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/semukus.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/82860871095.pdfIn PDF document text
    • http://farmina.ru/uploads/files/95180559876.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/xedoziw.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/jemanigoxilivopukobozadob.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/nolipojobejewar.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/34687529016.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/32944572519.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720f53be8f3---45882214318.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/dt1tv2qair484rpip6lmdkqlk3/wodobanavoroduzag.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210808_D771671D958A0DCC.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/25117131885.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/16f5fc00d57ec1ed1712de37dce9ef93/13477715599.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/nomat.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a780d3c4358---fudarigoderatavatopofapa.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/41552740076.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_off0000cac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC2 17756 bytes
SHA-256: fc9bb9de584ccb51c90e19342882558ed17b87b681ed10a99a590bdb49757bd2
font_01_sfnt_off0000f7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A0 11360 bytes
SHA-256: 1fcf31d7e129325dea7919efb7a1c12e6c53ec20f3fd9ecba10a8a8403809624
font_02_sfnt_off00011254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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