Malicious PDF — malware analysis report

Static analysis result for SHA-256 4502d08192beb143…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 00:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d65f532b0d3647564f14208fd2be398d SHA-1: 03a880bbcb1e051a4a888fbd49cb88f4eb3a1e7a SHA-256: 4502d08192beb143f49c7537c614464d9c6025085da6e56ca420b0c111e4b1c5
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised websites, suggesting it's designed to exploit vulnerabilities or redirect users to phishing pages. The primary attack pattern involves using a seemingly legitimate document to trick users into visiting malicious URLs, likely for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=lg+k20+plus+operating+manual PDF link annotation
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075a7954e7c3---54035573812.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a5d10fdc04fd4b552208b69c8be33755/motatafodizamuput.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qs026s3qrsb4ipnic66gujun77/lobepixadibalabufenovo.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/58baf660fa2c4a25c947a1897404a9b1/14590015647.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/retogibitabasew.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/zowujuzuwed.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/21274426801.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/80272341949.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/danenuronimumak.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5c8adce487bd46ab798f4e6992ec2993/zuserixum.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/rifineluxepazuno.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c094f205e7b---32074248327.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/24997748076.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/3up44vn2ncf4rdff5kt2q210p6/21784901770.pdfIn PDF document text
    • http://www.zima.snowcat.pl/admin/ckfinder/userfiles/files/42291519474.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103131f352ba---75821882810.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/muminorutesu.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/kolekegamodimijifomusuvi.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/24114881665.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/jagulaliguvibituluva.pdfIn PDF document text
    • https://meccanicagambirasio.it/file/givutizazodoka.pdfIn PDF document text
    • http://alvitraders.com/files/zukujufibikimuwuvubi.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_off0000de56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 10984 bytes
SHA-256: fd91b08965be410ed13844b761942135832f6e4ed6caeb98bed02f2728bbae6c
font_02_sfnt_off00010ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF7 19292 bytes
SHA-256: 875c7262bd118a37516550942082548abe63937aea0dd0d2c4c4117eb021b6d8

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