Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf3d35e4b260fff…

MALICIOUS

PDF

84.0 KB Created: 2021-09-21 02:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 29a4399922e39005085d9f1c48f50184 SHA-1: bddbbd1fa57fd39f946e9e33174785f4b9ee38f8 SHA-256: 6cf3d35e4b260fff96f99de5d5ad318f2a4fba2678dc2542b9427ca0e67bd8a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://coretry.ru/uplcv?utm_term=watch+harry+potter+and+the+chamber+of+secrets+full+movie+online PDF link annotation
    • http://cuoredicane.it/userfiles/files/wofeneraruw.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/luxaru.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/67266978394.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/e4331523d09bf07035143ec8fde4037b.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5f70ed14b---80851455839.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/4618938207.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/6660cd813be843c800cbf661a7608784/xupiguxefapewal.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/55806905985.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/85056232148.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/37515614113.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/12339237148.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/raroxilejifijufogarebo.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210907042732.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/65585915123.pdfIn PDF document text
    • https://kokomanis.com/contents/files/zinenogojirikuwoto.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141199e90df2---vopaguvovapakilu.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/domamikaxurit.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/zobefanejovimorulukor.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/wowonixowulif.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210912_4F7AFC90507BF8CF.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-1/20210901135807912085.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/12831636517.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/52566333792.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/m4n7gjbl9hb1aqivaldu70hdme/94461189762.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/95405441285.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/fegevare.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_off0000dfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 11300 bytes
SHA-256: 0368bc7eafcf1b44b876638147f139717a9f2a71dac4bc3dc0c67862ee9791e4
font_01_sfnt_off0000fa01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11213 18140 bytes
SHA-256: a14b738e20f7bf4eff859fa58622eb7b3ac2868153a620b732905b8a544bb99a

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