Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf9087daeb7915a…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 12:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 714df34650d752f79de924b03e6e1024 SHA-1: a98a35fad53f1857952ed0da0e7ac1842e6af6a5 SHA-256: 0bf9087daeb7915a91006f4fd8902a7132ba0b14656153a8af20a7aa81434bd4
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic 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 0.9972

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://medvor.ru/uplcv?utm_term=bin+bulaye+baraati+full+movie+download+720p+bluray PDF link annotation
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16131b35a310b3---11385840849.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/61240215614.pdfIn PDF document text
    • https://successalpha.team/upload/files/sajukulosopanazepub.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/88286704030.pdfIn PDF document text
    • http://atrsara.ir/resource/files/bolen.pdfIn PDF document text
    • https://asiapharma.la/files/files/fajozonenivenavejatikunu.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///zipubase.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210916_71CB95DF0F705E37.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/sifixupoxefivufijinex.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e92d1a89a2---97646822233.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/mokejasurila.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/romuwelixeputim.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/bunubu.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/kikegadanita.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20219518340555.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/nafaxuvifiluzoga.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/thgfneqg31huji3o8c21tccrf6/rumapapaxemafo.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/poparopoxumotunugun.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/danedulodowo.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210910164317278466lkzbz.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/25912752945.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_off0000e139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 11340 bytes
SHA-256: 3cdcf662f39e66dd25dea6934c11bd45f2508c2d8290c82620c74655016c7389
font_01_sfnt_off0000fbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E9 17468 bytes
SHA-256: 2259d38e3584eb9ec7a94bab02d8e313aaa18208a82d3079092de989efe76083

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