Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1b4d2a4df0d3c2…

MALICIOUS

PDF

170.9 KB Created: 2021-07-25 19:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ab44ea68910abd71060595164de3cf6 SHA-1: 5eb28e40ae289dc194c22b5ae3ddf8399514a17f SHA-256: 1e1b4d2a4df0d3c29da2bad012ed2074e277b621170b6cdf02ec7e7b46daf03e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or manipulate search engine results. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://detskeihriska.eu/ckfinder/userfiles/files/kigogoru.pdf In PDF document text
    • http://rkmaster.ru/uploads/files/66408776228.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/xolataf.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/92025761712.pdfIn PDF document text
    • http://kimthienbao.com/userfiles/file/jasapuluti.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/79646356948ec3db83b50f6c20a0e0fd/tunoguxatexazepo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bedd2ea11f---nalejukutugokalaji.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607405b4b23b7---redisalekokokiwosefuje.pdfIn PDF document text
    • http://beiks.info/public/file/pezonedorepuxiv.pdfIn PDF document text
    • http://rld-carbon.ru/file/sowokuxopow.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160792d7a63c0e---13367254730.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/wonemojarivawunewata.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/up7g7gitdcq9khheqca5tc4343/8930532947.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/rubutuv.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bd7c03e6b---bupakabomajorare.pdfIn PDF document text
    • http://shophouse.info/images/files/kikukupakitadotiru.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e5710ff8c4d0c5ee76c007bbd6c1523a/70627654915.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf9884f99d---dilesabetojuxovinotem.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608530c4b49d0---50908411109.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/64597115022.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/witejukuxusu.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/nizabo.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7ffcb166f---sifewusoposimekizozanu.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1d78ckoe0qlafbi7m6c4teg9d4/75210002951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=when+will+the+new+update+for+minecraft+pe+come+outPDF 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_off000236b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x236B8 10896 bytes
SHA-256: 14493e16354ae9db709af7f17c031453f5355aa33726abb28f21c429e886a152
font_01_sfnt_off00024fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24FC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000267d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x267D3 20744 bytes
SHA-256: f4228eb14e8df45b6445344925d9d7dd0eddfaae42efb46a2ca8952d427e5f95

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