Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd5fc30bcda0319…

MALICIOUS

PDF

86.6 KB Created: 2021-09-03 15:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 988586152a3e8276343d52194d8e60bb SHA-1: 6be87db40026dddc787f0a5a39dde7a178033f3a SHA-256: edd5fc30bcda0319a1b648e5a0c1c34db766a4be5f7a3cb2f45e51bb08a87543
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to malicious sites, potentially for phishing or to download further payloads. The presence of multiple compromised or suspicious URLs indicates a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=weed+science+journal+pdf PDF link annotation
    • http://zonazero.es/userfiles/file/pivupuwazogeje.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dfef609ad---65202236431.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50969643f2---4018174206.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/48100372711.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/zulorupoke.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ae16c2389726782bca9ad74a02a3da46/18389310004.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021070700003373499.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/76437176409.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/vajimod.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/24367501730.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/96113655070.pdfIn PDF document text
    • http://chinahongji.com/d/files/newevosuliwexaviweg.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/wusupet.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0087e3f5b---nafamarijelowovipi.pdfIn PDF document text
    • https://ayurmitra.com/files/file/mimeze.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/32733349339.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2d9f0897341e963f370a81130b9d2d7a/bapobokojud.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/jinabuferugukajakik.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/mpauep8bph842ndt3edfqlvp35/1570792003.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/81320010168.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/bepaxopibinoxigumaporowi.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9e1d1fcc6---giweduzivafibuzu.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/bb56a5fb4b7b2b1b52eb7eae70a62ba5/xedibomusopunajakigutowa.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/232134594780.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/dl5eo1v8q0nmd0vmv0itlibsva/48393519662.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_off0000ed3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 10736 bytes
SHA-256: 12a6b23bbce907af4baa729bb68961427b18b9cd10a265958b1934bd2aa44345
font_01_sfnt_off000105ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 17956 bytes
SHA-256: 7f239671a5e9d386c51d0c406d7bd2fbc71175cdc61348f70e03afee75aaaaf1
font_02_sfnt_off0001345c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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