Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f61227e55833b99…

MALICIOUS

PDF

87.2 KB Created: 2021-09-05 03:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a83860337f5ab8b9948b60a3605e1de8 SHA-1: 91fade930f706b790fc141ae1cbd995eec80944b SHA-256: 4f61227e55833b9926d19e6826e7416572624b272f4d87e933e027a3fccd11a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the document functions as a link farm, likely intended to redirect users to malicious sites for phishing or malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=types+of+paragraph+and+their+examples+pdf PDF link annotation
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/6ee9be26aa4a2789751a2d791a6e91a1/vazerosinufajurafite.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/xaserivevodanar.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160d561c6d8a91---34427201191.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/q5qvmm8kblsnphr7rq3ebiqfb2/xegopipekako.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/6hbu9c0rgfb970cm6h7vhb1jrm/tovan.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117ed2ed9db1---81170497714.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607827c49aa36---kotewutokobome.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/50673827252.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/jixuw.pdfIn PDF document text
    • https://hoavily.com/uploads/files/tizubirazunetesab.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/vulexuruja.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab06b22cfd---82302939242.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/p0foilbhpqfvkp91cmbj5p3a3k/12083078067.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1628438340.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf255e11d9---nixexoxuze.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/inc0tptdaupssd20m3p9iker3f/xajotuzabil.pdfIn PDF document text
    • http://allycatering.com/userfiles/2301887133.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/30737740514.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/ocv3jnjoj2sfkmkjd4n90bcc84/fogid.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/nitilobada.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/53256365146.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7440fda8---77496236622.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c79bf920bb049b39a2d164962c644caf/39824530609.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/35183856719.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/59261144629.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_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 17460 bytes
SHA-256: 5a811ea6f53832fd7bd7fec082890d76cc0f36b037ab76887e06a23499108b8e
font_01_sfnt_off00011d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001358a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358A 11124 bytes
SHA-256: cecf5078994cd89c3c5e926dd0e63c5498fe325e8cc02c29a314bb5bcbbae3be

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