Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c849d56da1e6a68…

MALICIOUS

PDF

73.6 KB Created: 2021-09-10 11:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 810cbac3f74a361bcb238ad91213dca6 SHA-1: 238a7112cbd952b3ad5cbd274cc9e82b9cf237d0 SHA-256: 7c849d56da1e6a6878ddf1175c51ae404c9bac0712180e140f9278151c37ace4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to lead users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=viking+wars+mod+apk PDF link annotation
    • http://biomax.shop/filespath/files/20210908150019.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/41043667370.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/33212551102.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/makifuperuxubotobe.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd2b2774d---gozeberowowekevun.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/kogomanim.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/dovizafonaxopoxomuxa.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/jovisulokofas.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/dopupedawujemikimo.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/5444851521.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371f10d0a39---13537210416.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/xegare.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613876926c638---budir.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/wivijawizixugaba.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d713b5296---wuxoxipuzux.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/xewajimemudupin.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351aad4d1c3---63034635932.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/nizasaladu.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/30854597570.pdfIn PDF document text
    • http://langmypham.com/luutru/files/91888269721.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/wowapeberijuwefebid.pdfIn PDF document text
    • https://iwistw.com/upload/files/49737992451.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/risezapebujapififu.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/kajodewipifolatedolenelim.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_off0000bb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AD 17480 bytes
SHA-256: ecc6a2e3cb447bdf232c51fd1b9620446832acd6f1717a7ee5c133fcdbc3e795
font_02_sfnt_off000100c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 10604 bytes
SHA-256: 24202aa39881ee6bb7b1cb816778ed4fe80b2b16a5740bc246261f439678fc68

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