Malicious PDF — malware analysis report

Static analysis result for SHA-256 6534762e68b6f572…

MALICIOUS

PDF

85.5 KB Created: 2021-09-02 05:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b7bda313e0828873ebc2bb5d921cb369 SHA-1: 102bc483961453cfcb367ddb9693aa449531ef7a SHA-256: 6534762e68b6f57248afcbb2b1788057284dd08b78fbd6fc4ace2abdb9531fac
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.autopsrus.com/ckfinder/userfiles/files/3697165116.pdf In PDF document text
    • http://altaprecision.com/userfiles/file/xegejugadovorizijeke.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898a703d0cf---38931009135.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/gapowunobetu.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/45029007625.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161076ba52302b---poxifirisib.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/6dmkt2l2g2uflidvdc7cohgjkb/digilipu.pdfIn PDF document text
    • https://brod-plovdiv.com/images/zurolotabozibi.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/wakifelaxodubunu.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/2a2e8e0808eef0de1ccd6a68f243664e/24161285757.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/tapoxerojori.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/finorejivu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608690a440014---fexilozazorevadewumeg.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6788f36b1670be20cacf3ce341cd627e/43633112566.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/29127282428.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/mifutonepiderubevadafaxor.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/lofelipowelagev.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/hm5qeq86o1f585a5aeivs9m1t2/28655273241.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/88799528794.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/62077034706.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84eceda33---nifixorug.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/40785915158.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/71788942183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=words+and+expressions+solutions+class+9PDF 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_off0000e613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 18848 bytes
SHA-256: e3afbdb91b232cac458aca0a493c6681ae40b6efdb43f083d54954bb24f0316e
font_02_sfnt_off00012e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E21 10872 bytes
SHA-256: 5d988a102dddc0578f518b71d17ce5783185a6ef734a5c1be5cfb26e88b6c5d2

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