Malicious PDF — malware analysis report

Static analysis result for SHA-256 26595bae5d5d6ae1…

MALICIOUS

PDF

89.0 KB Created: 2021-08-20 20:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d392b025b07eda7b389138a661214006 SHA-1: 4cc0821ee1615c5adc056b1b3fd4c68aece073b1 SHA-256: 26595bae5d5d6ae15c72906172d408234a52089d4da05bce2a998ee17306a7c8
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 within documents. It also features a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to phishing or malware-hosting pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or as a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=basic+english+sentences+with+hindi PDF link annotation
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bf46457498b67f9fcf3639b631f41c22/37373073506.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b022552ab3a---45022172277.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/tiruzerozar.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/fenibofodexifaragevenejor.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/2416022767.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/70335199558.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/wesesiraxatizuwajotaw.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/nojiwozatakitadizilanomu.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/73798852501.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6dbb7bb626085ee5026eb12a57b9d5eb/34278993209.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/98517452382.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/27160821878.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/58732942121.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec88715d29---42214760614.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/8c343f9de7453da22f613d2b60429b8e/25453384197.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/rivelomufobapoxufu.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c33457748---19232580616.pdfIn PDF document text
    • http://allasclub.com/campannas/file/97922803679.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/dufidilapetazi.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/22000393335.pdfIn PDF document text
    • https://geniodelweb.com/file/50206090243.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/81094083961.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/39866703911.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/72035788220.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_off0000fa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 16832 bytes
SHA-256: 818d749029edbe5e1c427120a26f1a0e6eb1087e49a53d329015e3db557804e4
font_01_sfnt_off00012626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3D 10568 bytes
SHA-256: 68091f4071873359c0ac402f0dcfc852329218eb0610a738027a9e0a2fdf12fd

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