Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c81e1926bd52063…

MALICIOUS

PDF

84.0 KB Created: 2021-09-10 02:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16afbe8f825a2efe9bf19c2c0a79a195 SHA-1: bd7b7ab94ed1ee132732efc1c816f4b2cd6e2e65 SHA-256: 2c81e1926bd520634df87b9ad4f2da496c948b5c610831eb5222b2dae86968a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classification and ClamAV. It contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The presence of external URI heuristics and the link farm structure strongly suggest a phishing or malware distribution attempt.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://watosaphotography.com/app/webroot/userfiles/files/20210905_051450.pdf In PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/jhf3lni8p11apoommu85pto677/16444651409.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/d8ec36f9c2823e12e183ee0ede675b23/33081030018.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/71111798883.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/8097040460.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/nuvufuvopubunudenoza.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/16627266515.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/68017404923.pdfIn PDF document text
    • http://futboltotal.net/images/files/84284514320.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/reselepoviwetifexowe.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/gejagozebolidasolo.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/45439643010.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/tejimul.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/39798499426.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef3cb83da8---61804527512.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/javowukugasexenedewu.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xedafoxebowipatiz.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/61776732137.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/sixavasujutoxa.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613583b0c1f8b---42145666939.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/pajoruw.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/17317588663.pdfIn PDF document text
    • http://pinxedien.net/upload/files/fukitutewifumijedixetutus.pdfIn PDF document text
    • http://synphabase.ch/upload/file/46984255425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=call+of+duty+modern+warfare+2019+elamigosPDF 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_off0000dc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 19184 bytes
SHA-256: 9f1fe858fe86e9e016acd00e502666ede32f6909aa38455347511bd444fda8ce
font_01_sfnt_off00010ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC9 11488 bytes
SHA-256: 8cc42d88dd1eb13c62746c9e59f164d8cad74b6a196eb70f3f619c0547827064
font_02_sfnt_off00012a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1