Malicious PDF — malware analysis report

Static analysis result for SHA-256 242005893c8a207b…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 02:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7bae85f8a238e70f5197784e5a166c07 SHA-1: 8bb1227fa3c0e82f76ad3cb0d844271e58ac14e8 SHA-256: 242005893c8a207bfe9a0f46e4f7f6f0cb3b9634e821e056cb65a15a26a5e24f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host phishing/malware. The embedded JavaScript, though not fully detailed, is a common vector for further exploitation. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://stcc-sa.com/motakamel/Ups/files/nisidigikuperenimetibefu.pdf In PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/buwirexuxikokiwisomofa.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/83945296976.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/144f9125a2783daad6290668cb8cff12/63640255115.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/69950089798.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/06afcaeac29eaf1859553c1cdf6b66ca/tubajevimavajovopomiguju.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/fesiruso.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/duvorekipekipifugame.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/boniravivuzukivep.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/73726194959.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/jogaf.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131228437aad---4657582275.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/64654166077.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///86471124762.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/15f8d3eb4311bb51d9934e85d34e75c4/pulizuge.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/5559856733.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/pabiforivazoz.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/nepopafalepixof.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133b9f6defc3---82143603468.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/76332676044.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/33197482651.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/67007760271.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/41290227439.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/55510104466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=int+android+graphics+bitmap+getwidth+on+a+null+object+referencePDF 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_off0000cf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7B 23128 bytes
SHA-256: f765e7a0946926db07dcbfbd16ccfbf74b6693680e59fade659bc49890b59a76
font_01_sfnt_off00010ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FF 11472 bytes
SHA-256: b5e51f857b5e82f106e2b5483cce530a0234450d96e747e34c20c49e4fe69be2

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