Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46ebaff98d72f19…

MALICIOUS

PDF

83.2 KB Created: 2021-09-24 11:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1740f3b062fb0bee460ec23e67fd0730 SHA-1: f3d826cf0d096989dab07a24930417995c1f9329 SHA-256: d46ebaff98d72f19429776a3f5977b7e62d4022651c53fa02245c8b9029bc9f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms, suggesting an attempt to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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 http://jacsonsfurniture.com/userfiles/file/sorekugapijem.pdf In PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/bcos0flchrbn1h3vgafi0srdob/dutizizukanawovol.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/11312599845.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/40723141847.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/43904138436.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142feee7e064---fojujoretexepod.pdfIn PDF document text
    • https://ikima.fr/uploads/file/renozunilasiralodagol.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/libariduwipuropemag.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/pefaderupesirodonatusikux.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210909020607_849927853.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/sozugipemimomafa.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161403eb56337f---ligavejozis.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/jumorepagirikisumedi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/524428180c2c460eb99a54b60706acd3/77038398157.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/76176761105.pdfIn PDF document text
    • https://longhoang.vn/upload/files/49421281772.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/a24361e6dfe1d3bf4d517664ba08b31e/serosepidafikipiboze.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/verufodunusiwonileg.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/67903767129.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/woguludazeze.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/wudekowewuligop.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/20691538357.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/70537765647844918e896081db2b0a9f/gejinufitif.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/38951916927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+move+internal+storage+to+sdPDF link annotation
    • 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_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 10732 bytes
SHA-256: 2ee43618c463f80c880012a38690c556dd8e5f7e8ca2c5b218c100dcbe05a22e
font_02_sfnt_off000110ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CE 17820 bytes
SHA-256: dc43dc321d95e3d8a63dbed2e45ea15b56377a26aef5164851ca7b1d21a85cf2