Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31005a431e2b255…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 01:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ca6d109bb91063ed67934cb638393ae2 SHA-1: 107e76e1b214366a618a51b553f5e362af97ae70 SHA-256: d31005a431e2b2556753a19c831778f8f7b87fa952affac57331e97647885251
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the PDF structure itself is designed to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/4hefngkb95nparoeasru46528i/50725362861.pdf In PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/vaxoxoxajed.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/08f8f9204938c2a81cabb51247e6be77/8492731628.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/63562168518.pdfIn PDF document text
    • http://anm-av.de/uploads/files/xiridolemakojojewafo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf1a748d0---sonotuxetekoxaki.pdfIn PDF document text
    • https://emenu.hu/editor_up/novixuperonise.pdfIn PDF document text
    • https://ibextrail.com/editor-images/kizijafizukor.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/jetowuju.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name//files/mojuriw.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/qn61fvcn0hckacl8mm4rmagbg0/25592932982.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71febcb488---15427057635.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4100b7cb97---tekamozol.pdfIn PDF document text
    • http://flexa.cz/docs/file/raxuz.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/tawegorevurigawasis.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/44963279706.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/wizezosovalexubojobamo.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/50796989367.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/gizafirelorolalexulisesow.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/f28bb5cd22220c8900f502a58c1270e9/potakokasebumu.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/97064462249.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/89872011281.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/juvogalif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=embolia+de+liquido+amniotico+y+anestesia+pdfPDF 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_off0000db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 18924 bytes
SHA-256: 27f56324fccc616e53c2921bb58b9a746df9c6a81dd548f9a7c9a886482b87dd
font_01_sfnt_off00010be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE8 11164 bytes
SHA-256: e3b39baa619d6d1c7e6ed2b018f20addea5f10f953d05096b458e03804f6707d
font_02_sfnt_off00012592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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