Malicious PDF — malware analysis report

Static analysis result for SHA-256 71748ea08597096a…

MALICIOUS

PDF

107.3 KB Created: 2021-08-10 19:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79008d668e83645fa5774546ebc407e0 SHA-1: d667ac27f9cfb28db3da45989c7658604b77b507 SHA-256: 71748ea08597096ab28c8892684dd121e8c84628700ac9bacde9b949e9e4af1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the ML classification strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://mynigaoe.com/upload/file/20210630100957.pdf In PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c141d7e02---93219906922.pdfIn PDF document text
    • https://pellevah.com/upload/files/59916591769.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/noselopusadekavilojerod.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/41509317546.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/os09hdrfkd5afethm1pp6e0v22/damifupi.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/kafobonog.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/84019837902.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874d7fc6c1a---vejizuzif.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/47348434532.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/pedafuzagojekapegojigij.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608495b321c44---tupajenak.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708a6a9b5ac---dekisifigi.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/9652316920.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/28364798596.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609db5dd5c85b---79054695090.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b564551ccb4---97885373271.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608231d9eface---44834657782.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/26e0uo9j3ea2m85d1obgs2709j/zewijesez.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/07bc7c992ce87ac188b38ba17e9a2b4f/nokaja.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/87731227551.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160779843a102c---fimexetadenewexojuwas.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0abf08470b---vufusigoledapiwibekisixiv.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/07e380260b51265d51a938ceac3ffbed/95727887640.pdfIn PDF document text
    • https://hiroyoung.com/data/files/kozivitoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=strike+force+heroes+unblocked+games+66PDF 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_off00013c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001544c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1544C 11500 bytes
SHA-256: 2e8b045dc83ffc979aa37d747e1845931d062716bba2d9afa7caee69e8b9b731
font_02_sfnt_off00016f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F13 17924 bytes
SHA-256: 3590149710a5b46a84d4daae534ebfa39d729ad897d6f92c5b77df3206ff119b

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