Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d0be8bdaf96cd8…

MALICIOUS

PDF

83.1 KB Created: 2021-07-19 19:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8cf362ad6026bbbe39bc4ced4944504f SHA-1: 720c30211b0a5a0f2943192bf5df6e18e0556544 SHA-256: 93d0be8bdaf96cd83d20d92e18e003152d63b9d729db693a4100811f16c7d43a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage and disposable hosting. The document body is unreadable, but the heuristics strongly indicate a phishing or malware distribution attempt via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ibtaker.ps/userfiles/file/17404909070.pdf In PDF document text
    • http://tele-klass.ru/i/upload/files/xarumowomuxomiwozufuke.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/9ce46be74b80dd3bf386ab7b0cc08c4b/jiwume.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/sevavikimajalibavag.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/laavqvgqkekp8a4kjc7o0e69d1/kivotuvujeb.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/fafetodo.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/nabunujazajamelutewo.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/39680416596.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3vu8q6bqgmvomjuc9u25qoku01/26811571756.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160efef4c994a1---zusexupakeximuroji.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/533d8c932a80aba24ea5a8cbe6ff3404/gusenuvemunisolelesip.pdfIn PDF document text
    • http://stl-hk.net/userfiles/lusatomar.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/kiwesevupafenasas.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090b846d0849---kivuvisidarakulatukidul.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/9ffe6g7i58kea9vdtb059gaco3/tamagelesexom.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/kulesejiderujej.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/5c2a6e39000f016b18d1c002876bb5dc/16291615515.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/88556018204.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608be4c3c382d---pufaxobivemomeja.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e0968527b3ade91a04b9a8a692388a7b/90406194259.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d12cbee333---16937185301.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/fibajufed.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160cab9da465b9---67865181620.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210622175810_b4imej.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/7782806402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=a+christmas+carol+act+1+questions+and+answersPDF 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_off0000df95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 17428 bytes
SHA-256: 564520249cbe44f9c5af07d1a53fcee072a8c3712db82bbc994aed003f20340e
font_02_sfnt_off00012537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12537 11000 bytes
SHA-256: eb5294b0c84e2cf6b3821ed79f61d770c11ca91f842f4cfa803608e2b572d35d