Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f5ce2f73e66444…

MALICIOUS

PDF

69.6 KB Created: 2021-09-05 02:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bcce9cf9232cb0a2228793a6d69c3487 SHA-1: 46e494f01ee2b550f7d041247ce0769df6d821a9 SHA-256: 56f5ce2f73e664445ca6ce48636241f63e4a0dffe515b702703994c53677c7d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=jyotish+pdf+book PDF link annotation
    • http://jedzenie365.pl/ckfinder/userfiles/files/tibexewogi.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/delesitevi.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/40730236730.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610065be88441---84010660846.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/4rgq1gri8236dpebgsp713ttd6/35352877626.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/lojel.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/panofatenuxipamuzijex.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210821132116.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160709533eb917---nubivogutuzonezobopu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c71638e0f---bumikerinoliwakumawegi.pdfIn PDF document text
    • http://3lbordercollies.com/clients/a/a5/a537dd6ebb785c9f51a9b4acbfea693c/File/xawinovakifexomo.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/fezidepunukeke.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/74609642203.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/xepivulelisenonikuwu.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/70950614681.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/97319435227.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e1e214e5b339b38f8475f0b7577ac769/ronawanojivegedovopowexin.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a70a43783b17a0b981fb5819db045fa5/fagomopije.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/18oes85mn1ec11p3cpo2mvoqr3/96655729441.pdfIn PDF document text
    • https://flyags.com/editorResources/file///pedogagekowurokazo.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///95082199776.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55132194110.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/lenusasuguredurabevigito.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_off0000b2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FB 15592 bytes
SHA-256: 931ba0690b0120997b8cfe0de49a8fd1c445262df51f041e64654c2ce650d72e
font_01_sfnt_off0000d9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A6 10388 bytes
SHA-256: 6d9363f4db109c3211aca0b68a292f64cd42a419b36ca54cafa125ce7266ba08
font_02_sfnt_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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