Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bc989ca43ef75e…

MALICIOUS

PDF

85.5 KB Created: 2021-07-20 21:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b19e448f03db220860f26a70212c75bb SHA-1: 4f133519a94eee14ea17b18d411da9c9d4667eb2 SHA-256: c7bc989ca43ef75e7f7d7d1a4f01dec287e6b28d1bb2a74fb85c8c22ca614ebf
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS upload directories, indicate a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/744dee988b9041bd8d7e0d73f096f23a/ririlikotajemap.pdf In PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d0db40ebba380828721e575e8dbaa371/3548293210.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608249a490e3b---topasevezetefizexurezagu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5aec4f38ed56a3ef9ad48d74b7bcb366/vemasatewefa.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/66129985523.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/23168579845.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160851a2eb24ef---kozawev.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/69683094983.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/zajewifuzufulojejugazita.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ecefdbf32f5c004bd429ca590eb4ffc4/26944902178.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/bisefesulozamabovet.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210625_7AD34FC42C358CBE.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/5624112817.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/furufuku.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/92644957655.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/86801196876.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/87176994357.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/neposoriderapekaruwo.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071667db0daa---20391794074.pdfIn PDF document text
    • http://cuiquji.net/d/files/jovimafiditezi.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/15884930170.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/97071900150.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9b5cc388a---sazitetaximemovezizorav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=becoming+a+geologistPDF 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_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 16748 bytes
SHA-256: 752b383229d65736b25856e23cf9a31d35cf43c3dfa907a355963e9c979ebb94
font_01_sfnt_off000118d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F0 10528 bytes
SHA-256: d4503edfe099acd0f222c9679f7ea65b1627184b1ee4de2bc44beacf012885c2

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