Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdbed274d8208a6…

MALICIOUS

PDF

84.8 KB Created: 2021-07-16 13:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d5714fbca11e4e6cf36946926ddce076 SHA-1: 40c14090589add51d3ba833546c215edd7596c61 SHA-256: 3cdbed274d8208a61a2db9231f2e1762f11bfe7ad2c6132bf554870c4be3d46b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised websites and disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=solutions+of+s+chand+chemistry+class+10 PDF link annotation
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b44a2f0523---vuzebinot.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/dokonimefotubosubazupiv.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/73165779387.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/tifuwomofezatozilubi.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bad813197---64536884593.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/loboniv.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/31169cd87c815b116e993198621b220d/76560905052.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e778a8f812a505c36ddb4226249a131a/52394795893.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/49130219180.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5de1ebb7169345ff3b55ba3ff4afeb02/depas.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/a44b1690bf283ad40c79f699365901d6/baxafivag.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b390bbc5d3---64514386220.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/98136255121.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-23/20210623022919939586.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7deacad41---junefepefarifax.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210608112113.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/xonajuratex.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/senilubisare.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/895afd912df5025aef0ba8b773e950e1/gobigubelobavokelenif.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4ocg62gre6iptsgp64618m30l1/mejamewisixefujikezoba.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_off0000e8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 16664 bytes
SHA-256: 5e17f7f9d302d37b78f272529942b7e4f1cd57691ceabc925ec5e32a968f7779
font_02_sfnt_off00012c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C26 11204 bytes
SHA-256: cde0274e8ff919cbb5da3b40bfbf92751c24244f74ce7ce5ffa9c9f460c1f04c

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