Malicious PDF — malware analysis report

Static analysis result for SHA-256 f898c47e5062d397…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 09:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 766eeb751602870597eafc05bfe71f75 SHA-1: 6965625bb4de524104bd0d8213b57f50d964d757 SHA-256: f898c47e5062d397c4f381551255921fa9267070ad052215d426a41711ae70c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The PDF structure itself appears to be a lure, leveraging SEO tactics to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/cd14c50d33ab9232f77772241fc52936/vukoketagixuwapitigure.pdf In PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6fc1a878---70077015292.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/f4c905f602ad852deb202f275b9a06f0/taxixazedeni.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb24836f84---70329915589.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/63514369075.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/23544595297.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/7de9e4a92bb9d3c85988b1f5a0a274b6/24219853005.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0uvc3dl5tetbsgk52mhc5ldmk/6127177658.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/nabidupezil.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/kawugamebofizasutusigu.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/27147851366.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/svvrd8d8a7h7r0fiaqr18tlf32/66975491018.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bebb11a30ab---22527554622.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612181cc7da26---ragevinira.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/30378665447.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/54494030423.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160783d9fac2de---maxibunopebatek.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/86305331348.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/98035022456.pdfIn PDF document text
    • http://myredm.ru/uploads/file/fevewukuxujatotubo.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/vobukunawejifubofamipemog.pdfIn PDF document text
    • http://gerocuki.hu/user/file/73282201961.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af7387a2fb3---zulunuraxif.pdfIn PDF document text
    • http://liyangah.com/Upload/file/ponirinozitirigaje.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/43152210224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=readings+in+computer+architecture+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_off0000e15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 16496 bytes
SHA-256: 4ef00d1273d2032d4ff8d0e855d766f129887cc5e9e50ec9efc1faf52be16879
font_01_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 11164 bytes
SHA-256: a17ec3268c52a392169f839adaaf13cefc27d8855fe08cbcbfc6034c15dd07fc
font_02_sfnt_off000125b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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