Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf93d258db5da13…

MALICIOUS

PDF

87.8 KB Created: 2021-08-09 07:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d94ade2d2f0fd397353fa71a944dc586 SHA-1: 40e772b84dbaff56772e8ee1038594acc6f9ff7c SHA-256: 4bf93d258db5da139e5f65e97eff4d82d387ede59e5ffff4adac05c62df7f1fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious content. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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=humnava+mere+mp3+song+download+female+version+pagalworld PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad5fb5ced---7258302957.pdfIn PDF document text
    • https://daismene.it/file/24741940558.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/dibovadivom.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/35571452258.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/1840999838.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/18/file/20210518_062323_195.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9622e296b5---lumejavuxotebanogad.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/45694327254.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/laxarixuk.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/db7d792796610ecb5ac99353ce68a305/85793028752.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ea5e8a7eb---nexiri.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/sobafafipufejumumer.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52dfc25a18---rerefavufarelo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6aa73de29a---makabe.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf1310a838---zekujovu.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/37145674468.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/lejekowunarujudanerafu.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/49709926090.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/ledonipamipudotigazugug.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/55835644677.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/44880942651.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/879630c65d44b68b72adb1c6b1e5720c/womibaxaputunubigowudi.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/39204197947.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5b8404f78a7f104dd830b8446f50d9c/japufazimajewarusowuge.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_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 11160 bytes
SHA-256: a1b4b5aecd7b62a9e765044373f8018a699c8a2e3ba5ab8b3b07e1cc61e33579
font_01_sfnt_off00010980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 17748 bytes
SHA-256: 176021a1debd6ffa7231f5d70d96190b37e25c25f6d4975052d3bd3d96a1a40f

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