Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4cba22d40a74aa…

MALICIOUS

PDF

101.3 KB Created: 2021-09-06 21:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0250de93a84bb03565d4b56948ef007b SHA-1: b05d7996c27dcb22644952e4814628aa2d26eb89 SHA-256: cf4cba22d40a74aadf8a0c08dec57f5a50c4260a7215c68a7bd3942a7a37249a
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and is flagged by multiple heuristics as malicious, including a browser extension installation lure. The embedded JavaScript likely attempts to download and execute a second-stage payload, contributing to the overall phishing and trojan-like behavior. The document's structure and numerous external links to potentially compromised sites further support a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://hotelrealerimini.it/userfiles/files/58885805547.pdf In PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/84982335849.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/95561760383.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021080418011173499.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ftkhsiqid4vjalb806153872r1/gilefa.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/32582650336.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/vijisojevek.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/78445053593.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38d0d60999---20789989627.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/15770699930.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/mobaj.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f1b53ebb302debb6b9cdf355faec1002/wufew.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/silejig.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738f0d4c399---19234591377.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/ab5486fe3d0ede5450af462d393202a1/metajejojamewebijimid.pdfIn PDF document text
    • http://ttc-investco.com/img/files/lavosako.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/0b042976296a38c18931c1df34abb9d9/71736874226.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/kimomedixatupoxu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d405327311---6205588907.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/34288180653.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a877e7e1544f41aef291f8d0bfc902cb/rawomusafidosujudofajot.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/19077624801.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612473faa0a29---69219541583.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/66905745087.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/vupabagito.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161312a0b95fe5---zujavajixutufumekewe.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/98504844442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sony+dsc-rx100m7+manualPDF 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_off00012027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12027 10856 bytes
SHA-256: 7fae0a97c7ecf7639b592cd27556255a8893e663159b3d77e998b5065cff4356
font_01_sfnt_off0001395d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395D 21052 bytes
SHA-256: 149bc090a8988a2884573ca50c44eaa0accb28fa4d90d8907f0d5ab47964fdc9
font_02_sfnt_off00016e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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