Malicious PDF — malware analysis report

Static analysis result for SHA-256 166598dbbe36bc6f…

MALICIOUS

PDF

84.4 KB Created: 2021-08-25 00:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea77d61541baec52c3e18994f84eb437 SHA-1: b9b2eb138aae40c192b30edcaf33718830b90ee2 SHA-256: 166598dbbe36bc6fdf09be500c6dd658b0a82f3d991570c424439e2de7d6665f
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links pointing to various websites, many of which appear to be hosted on compromised or disposable domains. This structure is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nomylo.ru/uplcv?utm_term=impedance+and+resistance PDF link annotation
    • https://roweryelectra.eu/app/webroot/uploads/file/16200546959362.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10409a1a7---vojofopuwidoxagimukul.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/81e7c5f5953ed16d237bff5e6b6332c0/durezozeloto.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021072505132073499.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/jigafalisijekexovev.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/af99nrlt6g94rp0erjfu9kb6b6/58585740961.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-6/20210506045758437820.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/19b73eb6d50a30a3aa6d6c173d02b71e/jisobakikiwonuziloju.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/6870804380.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/miboxefojakopozexokok.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/64841563238.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/79632300334.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/37294567226.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/52b2c44d20b4c0124667fbec393d0bf1/90407865589.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/79866751307.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/b31fddc546ad7fd6929a7142cfd14905/20502791613.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ehqktm1u72u2vmflna5ojc0449/pibeseduwuforofedodo.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/42915946523.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a349f027147---22515774241.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/qos19c52ajsoi90pvlsb68ijpn/menusezakuzega.pdfIn PDF document text
    • https://impresa-valli.it/file/kuwil.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/75790293842.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_off0000e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 16852 bytes
SHA-256: 2f967c05b9d8f030ecb223ce0e0e402f2fcdc503c781760952f3abd11b01ce8d
font_01_sfnt_off000113f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F6 10460 bytes
SHA-256: d36ce3ae9a46757c11d7027fba1460af79bf0f6b5f997e6e5e931fbf42d3d0b3
font_02_sfnt_off00012ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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