Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fde1206a648a2c3…

MALICIOUS

PDF

74.5 KB Created: 2021-09-06 12:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 485d76b2be7a288e1fe809b65ee56918 SHA-1: b7a3c83ab42be91b1777b9475ac4202295964cc8 SHA-256: 5fde1206a648a2c388d1d2cd0cb476bab45991026f9bd9de91b766b82dff471f
156 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, employing a link farm strategy to direct users to potentially malicious downloads. The presence of numerous URLs pointing to compromised WordPress sites and disposable hosting, combined with the ML classifier's high confidence score and ClamAV detection, strongly indicates malicious intent. The document's primary function appears to be facilitating the download of further malware or unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=pdf+reader+apk+old+version+download PDF link annotation
    • https://ludifrance.fr/userfiles/file/35099151294.pdfIn PDF document text
    • https://ebooksweb.net/files/file/fesifuwotuloxulukox.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ace17484b09---5550190275.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/zalulafet.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/5ad64efee655492264660e9ff77547cf/xumonipof.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/patojuwubi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c093ff1a0e---63137927062.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/ce7894617d68e7807687b7de5a207fbf/69972256474.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/91707814455.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1f8d6d472---tedenifuwixumad.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d205693f972---xonemolazefeviwa.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608846d721138---39760581190.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/gagebevekixuzojewize.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/89uf7g93f1qfmnu9po2mtdhgn1/samiwetif.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d65a8b8502f73c0023b9f34fe5eceb75/kenozepizi.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/jodusak.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/67936963341.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/e64poiqmrv0p4pper86ftma30d/65665096394.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/mepigijelusepaxoxabejog.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/latesemem.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/35883815992.pdfIn PDF document text
    • https://kopari.hu/files/file/nemafupuw.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/92632786344.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_off0000c18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18F 16376 bytes
SHA-256: 030f4506bcbc316cbb71bc90d11c904d2857a3f15a0f363c15c54661fd76affb
font_01_sfnt_off0000eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 10636 bytes
SHA-256: 8eb18b8d2f9d27f20f8534d29faabbb3f54f610cb7dcb26fe5a68c4249388679
font_02_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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