Malicious PDF — malware analysis report

Static analysis result for SHA-256 d302ca0b1d1386ab…

MALICIOUS

PDF

100.1 KB Created: 2021-09-05 14:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f453c4f56398f946f0f5b1087df137d SHA-1: 1bc6044d277d7a1f6fcdaeb1816d553bbee14ea7 SHA-256: d302ca0b1d1386abe629d3a958c5086d6678dc675a111bd20b0598336a9686a0
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://irlanc.ru/uplcv?utm_term=excel+sheet+shortcuts+pdf PDF link annotation
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/aa5be6c1700c1816614edb4eacc66836/xavapixinonuzeluta.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/sufejomigajigesoluli.pdfIn PDF document text
    • https://nevisnews.com/userfiles/kuzuguf.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607724be88562---pepaperiva.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/46817583580.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/s1o0tsmg55mpm815443pp0m89j/56153558323.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/fasazeresagom.pdfIn PDF document text
    • http://pololanna.com/user_img/files/surerifedonu.pdfIn PDF document text
    • http://oicenglish.com/imagexx/files/rubasuwepavapifaneg.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/62235027559.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/bb2c732d221491f32ebb26331bf0f14a/42131220041.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/tenoxadesoxuxosirerifoz.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/92929586369.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/1hs8k5oov9bd6sdu0dt46mrqj0/60554407398.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/59974909241.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/zukunivererozizuzuj.pdfIn PDF document text
    • https://triosms.com/userfiles/file/11212409663.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/cb06a466bfed5e0f93c2fa65e4474ed8/45101018977.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/0edgji8cpmlg1k7lmit1hg53je/lurogutozibuxojenomexede.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/nideparewasu.pdfIn PDF document text
    • https://domilot.com/uploader/files/67221755299.pdfIn PDF document text
    • http://envigest.cz/upload/file/68403059309.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8752d7840---1172368214.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/fetokijoxiraziredi.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/79126217760.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_off00012027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12027 19084 bytes
SHA-256: 37440d0b66cfe81e512f25fe4951c926b31aacd60dc3fa0567c1dfab86eb8025
font_01_sfnt_off000152d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D3 10544 bytes
SHA-256: 36cc3f52bfcd3865f2cea866e3dcb4d9e7e46da0266c28ec42ae3d96b407822f
font_02_sfnt_off00016b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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