Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a8b78c08467530…

MALICIOUS

PDF

75.2 KB Created: 2021-09-11 14:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8961ed65672f5428996ac72c244a1107 SHA-1: 1ef10111a1542a3804b2af4e3b4de0c966d0df6a SHA-256: 66a8b78c084675308547b84279af9ea017f4c3e454ecd7d9bad9a9c8c0d94048
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. It functions as a link farm, containing numerous embedded URLs pointing to various domains, many of which are hosted on potentially compromised or disposable infrastructure. The primary goal appears to be redirecting users to external sites, likely for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://levne-pohary.cz/UserFiles/File/minigidupasunuxerukezi.pdf In PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/vikimikidufudenoxosorebik.pdfIn PDF document text
    • https://lapakunited.com/contents/files/765727293.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/81214030814.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/37095507816.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/jozizegixukowidelaxu.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/63008024757.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/revivobije.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/fapojawisimarerenol.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/he2gmtt5t1a6qrvolutprct4h0/sezuzikubiberejavebanezo.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/52230335771.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16137490ddba2f---wekatijegujasalokorunu.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/garotepamezinelizo.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090613314127.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161357cdfe9764---15656692281.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/susimerovatomidi.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/tukilufej.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e78b16169---xapovo.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/keliginunekiwagonirupinu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaf0ebfeef---72406006937.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/92309088323.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/mobunuzuduxiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pixel+experience+rom+for+redmi+y2PDF link annotation
    • 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_off0000c1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E6 17160 bytes
SHA-256: d0f477b5672620f542795554a7f0447d277055819177170adc0509dd668e6788
font_01_sfnt_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BB 10688 bytes
SHA-256: 576b9759d7005e74c15f954f08b878dfcf4eef7a5c8748eebec9fdf1d6aa1882

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