Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33d5e0a910c78b6…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 13:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a3d0bb24adbdbbef3b5054400b93339 SHA-1: 4851f8eabb73d5335c5a628cf931fdd78821b36c SHA-256: c33d5e0a910c78b625acea61ca6ba45915b53d2822fed74feb6810b23e2212d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to external PDF files hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly suggest 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://magyar-logyogyasz.hu/fileok/file/fidopo.pdf In PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5a52eebb0---bobadenafodupud.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109012050113965.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/391215607.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/16125898217.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/sizidolep.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091805594179.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/16384984899.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615197249210c---xesixifirudolofom.pdfIn PDF document text
    • http://masonhn.com/d/files/kizofofi.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/sevumepusanogodemuxakom.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/funanulizenesebinonutevi.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147c06a45cf7---63288542558.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/17535119826.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/50745939096.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/77755414645.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/lamupiteduwawidarewuda.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/21098493765.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/rebibikixodixolewepikukal.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/032aadf77633898ea997a226861ca060/1344368609.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/22342947917.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/tipijupapefekosun.pdfIn PDF document text
    • http://baove24h.org/upload/files/94841587708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tokyo+ghoul+s+full+moviePDF 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_off0000b133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB133 10532 bytes
SHA-256: 460a598929d39c97ed881c51f41d8d5896a262f16c59de237251220d12f9cbf7
font_01_sfnt_off0000c93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93F 15036 bytes
SHA-256: 6463cf63c4a93b9e83c9521de3cdba287013c388f8b841d7b15d69334f029432
font_02_sfnt_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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