Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b08f44f756523f7…

MALICIOUS

PDF

84.2 KB Created: 2021-08-29 11:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94d884e7fc1429c206af794968dabbbe SHA-1: f5d27e86cab632952133d9c8a97ae27c0e304f68 SHA-256: 4b08f44f756523f7d33eae35b77eec6b99fcb3f3f78380a058c57efbd66ec873
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external resources. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=when+i+swallow+ears+crackle PDF link annotation
    • http://gtshotel.it/images/file/87389172675.pdfIn PDF document text
    • http://honda-vo.com/upload/file/25313292229.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/sonuripajelomusen.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608818120a4e2---jiziw.pdfIn PDF document text
    • https://digireg.pl/upload/seborimobisekoba.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0aaf7fe2a0af478810c9fa0f03f3c27c/xukewajikanebalaxo.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/86518664822.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610372ff22014---jevezaboguk.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ee5462669---53911478586.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953a2d6d93d---94249565890.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/f23dd5d0251b6f609dbee441e595b4e2/79835674902.pdfIn PDF document text
    • http://asustainable.com/global/file/53125893815.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/46352362899.pdfIn PDF document text
    • http://web68s.com/upload/files/limibivulimorug.pdfIn PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/71557280933.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/pusebalazid.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/sibefelotude.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/t2ajtu3drh3p8gljntkukmh0n7/wonajumiveko.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097ba8dc0f49---49664933064.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611bd1aaa27be---lizokojofujonoguromak.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1625711072.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/fumetaguz.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_off0000e699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE699 17276 bytes
SHA-256: cf0803a97629501c50b3c6615cea082b2e8ed51ccda7eca7b1bf88ea899ac712
font_01_sfnt_off00011347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 10400 bytes
SHA-256: e6b51570bd99d0e4c6280e92e900035706025e09a47a9e8ebbe8d181090773d1
font_02_sfnt_off00012ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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