Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c2339a6ccdedae…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 01:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6b03642bfb383028acf541f0d21cd354 SHA-1: bb4f5f52d4f8b5a605ca692fd9fcea183441d0fc SHA-256: 06c2339a6ccdedaec5bf41b54171022870d0d0382399d5e508160f90933ef553
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads. It also features a link farm pointing to multiple compromised websites and disposable domains, likely intended to host and distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=how+to+combine+pdf+documents+into+one+pdf PDF link annotation
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/63521675770.pdfIn PDF document text
    • https://digireg.nz/upload/59393918984.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/7467345627.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/dthn7bmk9uh6aialhp2n540230/67913781322.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-8-22/20210822050613672553.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/sogkv35e9ei94csrs5lfjks1a3/20452029520.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/vawopusirifenagapijasanon.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16094741b38dcc---jugobofulenonusofe.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/18f09313d112b643af8ba9cf7893338d/nagox.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/gidelo.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/fubukuterejetuto.pdfIn PDF document text
    • http://cloverdiamond.com/file/sasib.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/kbh1ggkjgkpngl3gkjc6rjii16/69435264840.pdfIn PDF document text
    • https://cpc-serbia.org/js//files/kerozomamurasupoteb.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/nuruz.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7c73f036b---45627442267.pdfIn PDF document text
    • http://cy2hand.com/userfiles/16738671439.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/vonox.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/71383180411.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160753bbf26db6---86095924587.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/28044548639.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/kbupps6ut0857055q22nl2dk0k/51934197646.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/69cecf58a1dc7f610805bfed4c644a82/boxigapozetuzirijalinalu.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/japomavuwas.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/bf6fa81d61c5acb050ce462ef2fd5a45/jesavosasokalufeni.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 17488 bytes
SHA-256: deeffca1631cfefce7beec289dd73d7757f10b2f30ac3d2c25abec56e73e8551
font_01_sfnt_off000110f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001290b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290B 10788 bytes
SHA-256: b26b82a42299f29fa7e18aca8603c45be5f05f260d1ecec00afb7adbed2f898b

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