Malicious PDF — malware analysis report

Static analysis result for SHA-256 10599e0a3e480981…

MALICIOUS

PDF

98.5 KB Created: 2021-09-03 19:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 064ddd6437997da4ef3918d06c35f753 SHA-1: eeacb8af348287cc221b75aee4ca1334b49eb4f3 SHA-256: 10599e0a3e48098145df948ba2fdd8d026550d1659d03854512a7ce007effc7d
216 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which appear to be part of link farms hosted on potentially compromised or disposable domains. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document explicitly requests sensitive information such as recovery phrases or private keys, strongly suggesting a phishing or credential harvesting attempt. The ML classifier also flagged the PDF with high confidence, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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=cisa+2015+review+manual+pdf+download PDF link annotation
    • http://peneleos.pl/userfiles/file/timuju.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/38020273958.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/soropejabofop.pdfIn PDF document text
    • https://akemi.ro/hirek/file/bivezumivire.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b18793cbe49---povapaluwepef.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/81776229508.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/lapekoregutena.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/90985225963.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/lidizemomo.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/22471368197.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210531164125060.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/biwunodanuniwerutibizi.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/97911137839.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/furaxigiwis.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f79a03af7cc---sanote.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e00795190d---96088728680.pdfIn PDF document text
    • https://festacontinua.it/public/file/66829061588.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/51404458475.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/90886563564.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mnc0gog478u3068ku7ha9ejq1k/fulovezaku.pdfIn PDF document text
    • http://arablift.net/userfiles/file/fifuxezoledegifivumepavi.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/65486716427.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f60fc647fea---xikadunepipelutubex.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_off00011c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C20 11272 bytes
SHA-256: 51e9d30d2eb13ba3b47c57b397022c835519d3d7301d080a5089facf99d8fea2
font_01_sfnt_off000136bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ECD 17440 bytes
SHA-256: d6e9545bc4d2c0e0af5cdf1e96c0d3b5f822316a465b144350a2da7503913cb6

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