Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e67a5efeed1bb4…

MALICIOUS

PDF

83.4 KB Created: 2021-08-10 19:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f30da91298463fbf72858a5a4dd786b SHA-1: 9037430110a022f236b57c7e7fcd7bb46db889be SHA-256: 80e67a5efeed1bb4acf420b42551d0fb8af88920a475de4c57e23441a4032456
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://piotrkowska77.pl/zdjeciafile/80503277753.pdf In PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087375311ef0---17055544762.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/domevedusafenopo.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/66305995542.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/vejigikukenomos.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/4hi9o29cpptehe22a93un28s10/21855788769.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/24532662154.pdfIn PDF document text
    • http://normel.org/files/upload/file/18429738415.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/murudamaw.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fcd3bbaa5---takokakivomufumibomisufom.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/nolelofuzor.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1623f93cf49cba1d75014913f6e4e327/wodomolupofawaza.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90a9ccb6ec---liganal.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f765091f3a9---xemanepezivojugirunamokab.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/91a94c374293c3c26f993147dae72dd9/42218918418.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108d388c0187---fudimudonasagome.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/zubegam.pdfIn PDF document text
    • http://www.moyekolodin.com/files/lojevirixoje.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/53159219573.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa090e563ab---dizetukolevatuveralato.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/dd8c3e3e4586193fcd0baeeb44e5ee14/10465008311.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/monupuwe.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/ctv4vi1dnhcj6p0q0du03na8mt/39944396113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=convertisseur+g%2Fcm3+en+kg%2Fm3PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 18492 bytes
SHA-256: 473d664724b27a60c305c80f2c3d6f432cc30242093885b83ae7e08a9d5ffecc
font_01_sfnt_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 1800 bytes
SHA-256: 3cd4d369c657b400ed180d2cad238ede43e40491065d8c814e5f7cd4ed622247
font_02_sfnt_off00010cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC6 10860 bytes
SHA-256: 5df5330bb6c6f4d423b50afca3b9e608cb12e14ba1387617e54e427ebfd362d8
font_03_sfnt_off0001260e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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