Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99a3477833d255a…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 02:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bfa8a33019ec07dfe1c685da56a323ed SHA-1: 9388676cecb8ebfd784b6d02909b27a5106989ff SHA-256: c99a3477833d255aad14c2556233d4ba0f29002211544158ea0301a1014206f4
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=exercicios+campo+magnetico+pdf PDF link annotation
    • http://brickform.cz/obrazky/files/lafenova.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/jizulijejesawumini.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d15c51d63---46466484123.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5e7b932da416222aabd06eab8eb288cc/71556770447.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/85mt4158878tob3rg7242e0lnf/35344856142.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/mivominamutatisukok.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f43983e632---72845244378.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/nesufegina.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/45544025792.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/e87c1aa25173178d5d01f8240f0f30b4/35687003832.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/27592489156.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6ee88372fef0193eccb30d90286591b9/73177422161.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f6f214df99b---fulusibejerazazoronubokuw.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082331612e3e---45582957875.pdfIn PDF document text
    • http://d4squebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/jarinibonerusotumi.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/17552424919.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/pilogujuvupove.pdfIn PDF document text
    • http://ledins.lv/cms/file/kojutumimanofisupipufi.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/kesipuki.pdfIn PDF document text
    • http://hzqzg.com/d/files/xedinojo.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/lopujinavumufavagu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ade91f785---9767707489.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/vikupit.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/58e7b7014a1fa0f68645e0587174f78a/15549393925.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ce8e1e6977b5bd5ae15d5496e838c953/7127698502.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_off0000e5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE07 11004 bytes
SHA-256: 61404a6b2185574a42e2f90bc2c7fd14f10f33ff087cb81f3a7f07a2ba266d73
font_02_sfnt_off00011770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11770 19644 bytes
SHA-256: af502ba92376d98510a60a0bde4f5f5cbe89dc2db91fc9642f4a60f3ca9b8062

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