Malicious PDF — malware analysis report

Static analysis result for SHA-256 478ba96cba487148…

MALICIOUS

PDF

69.2 KB Created: 2021-09-08 16:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e00abdbfc8ef5d605903dc0b32ff6cb SHA-1: 876203230c698239b517136f081b736796a9a8e7 SHA-256: 478ba96cba487148d91f3123e08cfdb72ebe10b6bf509c7ac5b55ec98e0a1af3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing lure with an image-only design, typical for hiding clickable elements. Multiple heuristics indicate it's a link farm pointing to various external URLs, many hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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=barrier+free+design+pdf PDF link annotation
    • http://pro-roubenky.cz/UserFiles/File/vejodaxulirupixodezo.pdfIn PDF document text
    • http://aquatherm-graz.at/files/vojepuxibafu.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/36338021184.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/73287139026.pdfIn PDF document text
    • https://digireg.gr/upload/57617024503.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210908_7F3ED4044A2DA28F.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/jarozugisodakezumabekujep.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/sevufumasutidilibexem.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/65916695156.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/teluzizurifalizepav.pdfIn PDF document text
    • https://venus-forever.com/image/files/15496468611.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/wepijiboboxawifam.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/kedafaj.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/5802621371.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4f8cc193---55970633529.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65a922e0872ca5675a8724f49c5efe67/3081157025.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/kugiviredate.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/5026215854.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/2534658723.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/vomegepikosojetoxewedegez.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/zosab.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/rokuror.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161325557b0f3f---retonikatarefu.pdfIn PDF document text
    • https://whitesal.com/data/images/file/6638_20210901072726.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_off0000b514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB514 10460 bytes
SHA-256: f3cbd11c25dd112c1aa1d721767e2d0ae4ee2d2b847746903e6c8e0c94d6e6a9
font_01_sfnt_off0000ccb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB0 14080 bytes
SHA-256: 2208dbf943594b0afb171d936be4f432adc1acb5aab47d6a16a0a99ebf221283
font_02_sfnt_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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