Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07ce643d8bb199d…

MALICIOUS

PDF

82.2 KB Created: 2021-08-09 12:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1dae8be22a5f37079ac52b0448c69796 SHA-1: 65f31552e377a9b2b4f23482145a7bd78d4cea45 SHA-256: c07ce643d8bb199debb973c2686ef80a06cd955f83548ca6c37b76d57fda2b52
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document contains a link farm hosted on compromised WordPress sites, likely intended to redirect users to download a password-protected archive. The presence of embedded URLs and the 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggest a social engineering tactic to bypass gateway security by encrypting the final payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://archism.ru/uplcv?utm_term=descargar+pokemon+mewtwo+vs+mew+espa%C3%B1ol+latino+hd PDF link annotation
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/55t55m322mmfo8ptt2cplrvi9k/dizipixebixijusilupijepab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cc8cdb4ff---74998066916.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210624132508_kni50s.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d745f64254b---kafuvixexawi.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/25f56013e2dc2433f0c7abbc28f5381d/mizawel.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/4252204534.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/42322333847.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608380b086f20---84668234482.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/4af8f14f685f09d337c543710e38ebf8/gonesimalozepetaxo.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/laronumux.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/nafepagibilatirogo.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607200395eede---ralosipepuneviweken.pdfIn PDF document text
    • http://air-ned.com/uploads/files/zisobuwot.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/90724057203.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5041aca675---10996654137.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/rosujusa.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/aehbll59mq4qlgd07eadvtpmqf/tivizikopumel.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-4/20210604235300346019.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/40157079555.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df5284f94f---15511333378.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/33599187541.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098968b97250---73883244410.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/qp3dr0c68457v507eieeapb8td/kizugitisepuka.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/zezawalobe.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/koradifuk.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_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 11412 bytes
SHA-256: f84b8ea89b4727d02be284d6e009cf143c2dfe0400e7fcef910268d8c810f6ae
font_02_sfnt_off00010a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A71 18384 bytes
SHA-256: cf260edbec4a5819bd152c36d869dd53039690cd736f15fa16e5dd49e784f054