Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b066b510c2c59b…

MALICIOUS

PDF

78.1 KB Created: 2021-09-14 02:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f305879b5b25ba5ee42db9b416ad8feb SHA-1: 3d9a34d107a48fc6f86eb77014e0b5dbb1047dea SHA-256: 81b066b510c2c59b1913c05380c7f7cdc0c3301a2ee1152dc560448377dccadf
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 functions as a link farm, containing numerous URLs that point to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=vpn+app+download+for+android+free PDF link annotation
    • https://dynasty888.com/image/files/20210905_132933.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/75154332884.pdfIn PDF document text
    • http://ropesadventure.com/d/files/voxomokizajekibijajided.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/79109657639.pdfIn PDF document text
    • https://eklyps.net/images/file/70022614962.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/busovazasexalijurijemuse.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/197769ab42dd9b69de6e7357bb06d799/lesixutanizikobisebofa.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/94472127998.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/77887379704.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/59893902807.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/93282433496.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/76405773934.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/berosedobo.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/daleromexuwiferurozapewox.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/nezerameb.pdfIn PDF document text
    • http://pololanna.com/user_img/files/dizeromupopalonidugozule.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/bf738304f2d86f45a062793b97edee5d/lafewubok.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613625fac9dfc---rinuwavutakifibojudilago.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/mivari.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/nubexoxoluxujilepupusimot.pdfIn PDF document text
    • https://jurad.eu/files/file/dokumofusazatovu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613430c612e8e---49978709520.pdfIn PDF document text
    • http://korytnica.net/data/files/96959154144.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/dinedatitisozolawaxamatul.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_off0000cd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD06 10280 bytes
SHA-256: 0ab3489160f8ff9ae20b51743d19c6d4e39924a9604a7853ba118fe3afae79c3
font_01_sfnt_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 17744 bytes
SHA-256: 57afb5eceaac76e68769ef63a178ec02e2d2fe121bfd419c5779c82ca8d326d3
font_02_sfnt_off000112b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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