Malicious PDF — malware analysis report

Static analysis result for SHA-256 690799da7d4e8b52…

MALICIOUS

PDF

214.3 KB Created: 2021-07-26 06:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 142a1263f8db40ed6ce46eede67219ae SHA-1: 12458529855ab3ca030c5e45cb3efd11b46fbf28 SHA-256: 690799da7d4e8b527024b732f158e3f78e97fd3c00bcfe36608da2bdb03b6a96
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, suggesting it is part of a phishing campaign to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest a potential for JavaScript execution or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9709

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cgpreceptor.com/ckfinder/userfiles/files/xupejiwipusumer.pdf In PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd29c2520e6---31479142073.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098142dda26b---40369097260.pdfIn PDF document text
    • https://lemanssrl.it/file/tabudi.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75be05f8c---98584932764.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/laxijabekuwogonujug.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c747e470a---81795914766.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eaad65c98---15107128458.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a62ff4f3e1dd2a35af1bcb76b6edbb95/44848004722.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebb3d860ae---kinejijesarobilagi.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/88676795668.pdfIn PDF document text
    • http://lukinserv.hu/file/zoxevokufulufonutet.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/8bb07fdf0a8bbc49dabfc54427a7db81/95713800964.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf49e65b4b---zeseka.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d27222eb3---dabirovemade.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/48c1f05jtmdc6mn5fadtas5t35/fixaripovojowugofegideb.pdfIn PDF document text
    • http://afslab.asia/upload/files/zuxonabudesesefojiwos.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/712b86ffe12373e290febe47f5f01ea9/2285034865.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c13a27049d---51973496075.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210530105934.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/mugagiwijifetazanowozo.pdfIn PDF document text
    • http://metabolit.ru/files/file/54396250795.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/34917717466.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/9c772a2e84592de2f69002ab994adf03/8998196192.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a187855b0b4---gezazurevewog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cell+biology+test+questions+and+answers+pdfPDF 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_off0002e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E694 18704 bytes
SHA-256: 61d7a0877551eaeadb4dad44f2da0bd99ade65c8278b46694103f001a1e16e11
font_01_sfnt_off000317f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x317F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00033010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33010 11288 bytes
SHA-256: f0be32386163bd3a4afd3987c6433d4696edb1878da38a5668e0110c7796f525

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