Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcffdc8d1e0be52…

MALICIOUS

PDF

79.5 KB Created: 2021-09-09 15:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f0170f815b8b261ef13816494173e1cd SHA-1: b2bc4cea8fa3d3139fee05eadf6ea80c3b39b454 SHA-256: 0bcffdc8d1e0be52e6cfb651205183f808f55004cd85cbe4383bad2effccfe71
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to compromised websites, some of which are hosted on disposable domains or use UTM parameters, suggesting a phishing or malware distribution attempt. The presence of a visual download button further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://pistant.ru/uplcv?utm_term=videobuddy+app+apk PDF link annotation
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161305f27a8f6b---detakokimivuxexanipi.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/fasofe.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/nuvedirated.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613805b1983bc---ramabamedaw.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/47773686502.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130750828d9a---fobawinijuf.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d3ee78f1bc5890db43ba41f82d133508/50608203271.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/bugevikosopudar.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/58548712500.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/gudafogo.pdfIn PDF document text
    • http://drtamerturan.com/file/vilumus.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16136ce82c5b87---bidilazo.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/mitelofokatuzizuvujow.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/fiwokoluje.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/vugeworibozitanifufa.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/66424230310.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/12434325148.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/47791849050.pdfIn PDF document text
    • https://simorgh.it/uploads/file/38762058136.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/vukiduvikitikop.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/41856171380.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/51693174800.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/pirag.pdfIn PDF document text
    • http://atrsara.ir/resource/files/37371203238.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_off0000d1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 10284 bytes
SHA-256: 3118c55f7670e3a8651fd5186c852938076c5e7f7c2b0822385a877714ca0df2
font_02_sfnt_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 18496 bytes
SHA-256: 900db5955425a034c6f7b804219b30e2f9e48c59f1167b4789cac59961ce23f6

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