Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c82e3126904611…

MALICIOUS

PDF

97.7 KB Created: 2021-08-01 04:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 115a0b61cfa28f4595038836d0067bc6 SHA-1: 4fbdf636b1fb55e64c8206355100306cacf5a969 SHA-256: b1c82e3126904611a10b8b97d3d8ea44f2f1194dcf811c15b09a94003c8625fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/55bb6797b0cc5a4e6051cb3a2ce34c83/55124964277.pdf In PDF document text
    • http://shesob.com/file/files/fosobajulowov.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16089ef0670259---79268842564.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/rorofonikaxojifakulag.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///sasugadesux.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e6a5a8c980232e7341fd9f12810bfbb7/zugaxexeguzapamabosi.pdfIn PDF document text
    • https://orangerun.re/photo/files/8030119668.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/9993vcuj19g0q03gfrpce7lqmt/80638994028.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jp7uipg836lfc33pntgkbcl79m/44315023511.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/gonubitusixabagewi.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/60430780553.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/fipivezoki.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a645b62a10c---22973470089.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ru1cgqc57s9nmqe8t93ns35dlg/gavofiteduwidewavew.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/rifawolenelekudunula.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/kowipidizowekirotovaduk.pdfIn PDF document text
    • http://beateromer.com/bilder/file/winiwefiripuzoduxup.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/66611589174.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/vubelivowofo.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/wiwomelarofijukelevalinux.pdfIn PDF document text
    • http://npas.ru/pic/file/kuponemuzenisap.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/27561014709.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/1d31c12ac9b8047cbada10c0d8d6d8d4/jovoborew.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/28623394866.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/4ff548b589544f571d49589bd0b29d58/zadelozivinajawukoruza.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609836be96c78---48283178163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=que+es+el+ego+seg%C3%BAn+la+bibliaPDF 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_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 10500 bytes
SHA-256: 7d4cdf1304cb1f4f845925c287d256a0fda3b39c0ccc0f9dd018aac981f277c7
font_01_sfnt_off00012fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC7 18392 bytes
SHA-256: d7e34fa1dd4c40f2b8392e6e1f84ee8f7ad29b94ee3aeb44ca3ded494d5f7594
font_02_sfnt_off00015df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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