Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef35edfa39ef18d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 09:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cc0d54091dc6634af43e0934187415c0 SHA-1: 6b5ff5535054a01cdd4c08eeb3ebe25bb0420219 SHA-256: 4ef35edfa39ef18d898ca77a77e864d64858e6c251fd17b472b7860292e610f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which appear to be compromised WordPress sites. These links likely serve as lures for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://archism.ru/uplcv?utm_term=oracle+pl+sql+o%27reilly+pdf PDF link annotation
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/d8tnc9c2s7cgncfdc01dtetpj3/vuxupapoxufav.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/57343705363.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d30b786fea2ef0fa1648bcec8da25fe0/xikepumafeki.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/36638714053.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/56113153337.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6eced8ef265f299f9fbaca0894926818/96918823805.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/vifemirividif.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0b85ffa41dc1b00fc0db19899f47a37f/nideduzuwagap.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/65256539882.pdfIn PDF document text
    • https://cncunse.com/d/files/wezopimazusew.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/77388545999.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/16232003882136108624.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/7fefa639bda3f542eccba9694f6a1a46/39020155222.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/1910392719.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/4137634bd2a67aec1506c8c8b71826aa/95736693620.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/maraguzukexuwoziwadora.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/xiwinulurajabaxu.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079d705da212---40281642600.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/nr6phfoqejhc4ftuq5g77r65uv/baxazupobox.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f42a46b627---femujifejapovagegupu.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/rogikorarovuzeveve.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_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 17976 bytes
SHA-256: e7685c46fa68a8903dbe0d53ae3f563073d7ecd241de2f3f58d53e453b096e45
font_02_sfnt_off00012593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12593 10728 bytes
SHA-256: 5cc88c0c0b0548d0af155b7a75870379f9f3faeb29b128d8c4e9ebd1a4fdb9d9

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