Malicious PDF — malware analysis report

Static analysis result for SHA-256 59dfbe9ec7019b68…

MALICIOUS

PDF

70.6 KB Created: 2021-07-18 03:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c6170f7c0af0bbb1fece66345bd513c SHA-1: e2a6f93f36114abbdb1ce9550ef2272be119559f SHA-256: 59dfbe9ec7019b68574a1367f3b7d3a340408debaf44505a14cad7a3cb2f1403
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1908eb5654---16165593776.pdf In PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ed486ed2---darifanan.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6069d18712---zamuregimibuwironokereki.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/bofasenotufasoxepinovo.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/jepudasalaxigujifuw.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/fudobukafemusozufinufa.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/derinutufezudebopesibabu.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/m59trkifprsc84afsblc6qesup/54894027411.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/43621858971.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6df563bd71f1fc6ffb17cf4b58959706/nuvazetugibe.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/pabodupikuzakaw.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///47005399474.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/xubibebazanudomepam.pdfIn PDF document text
    • https://zenkenmoshi.info/images/files/file/korupajosizuja.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a137133734---76690603055.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/92403712466.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/2990339034.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c2ac6c3bc---72366575643.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3275f57465---jogabefela.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d89226d26---90172507790.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/6aebfa29bc0d6736f2dbf51592ebbc8a/xukobupiripuvapuguniros.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ke8sojgtl87mcvka93dbht05m6/31232779647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=draw+prediction+todayPDF 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_off0000b5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CA 10492 bytes
SHA-256: 4982ef4b869c025bc73912afb2b4dbd12601fc533b0106545ef4608f0bf8fbae
font_01_sfnt_off0000cdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCD 15480 bytes
SHA-256: 823b3b0bd5318cd857ef0f2d4d62bae14b2970f5eb2f0dd7928b94e1fb9c34ee
font_02_sfnt_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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