Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2bf97ba78d5b22a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 23:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2acd38fd550b0c92d00b3e7e1041d14c SHA-1: a5e3f3b8b107a0010a3dba8943acb829d55acc94 SHA-256: c2bf97ba78d5b22a4939ac1faaaf4e5ee5b9560acab2c921f7add06c8f00c013
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a link farm structure, identified by heuristics like PDF_JS and PDF_SEO_DISPOSABLE_LINK_FARM, strongly indicates malicious intent. The embedded JavaScript likely serves to execute malicious code or redirect the user, while the link farm points to various external resources, potentially for phishing or malware distribution. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://izometal.net/mm/file/14853281086.pdf In PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/fesinepejasi.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/22831018787.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/vijozananer.pdfIn PDF document text
    • http://mastervin.ru/files/file/nuxinitolujazufomu.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423327d2b51---ledowoxuwiwilavewazuru.pdfIn PDF document text
    • http://mweb.cz/images/file/putenizigajugekenisumu.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/xuvulekoborori.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/40150784035.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b6eb4c6821181518ce132ebe8c4a9372/wuleseremusarinugataxurob.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/pitoxuroguzetiliwebugo.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/xagokukezujot.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/33379372871.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/18999419579.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410b0c52e97---68008249072.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/saduwutogebubu.pdfIn PDF document text
    • http://pasted-radio.de/web/files/54690044281.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/moruzi.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/2347778205.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/78432139672.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/xanibuxif.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/juresimimesogiledijesor.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/nerekubeno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=tank+trouble+limpopoPDF 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_off0000c964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC964 20896 bytes
SHA-256: 42845e4582535efe3fec010854b004c81d9a8b8127db7e8d455dbde0e5a68dcd
font_01_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001188c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188C 10540 bytes
SHA-256: 7a5bc25de1829f76d4f65c17fb81265acfc9db77639c984ba70593ad83dd677b

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