Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf9f55fc406c275…

MALICIOUS

PDF

113.0 KB Created: 2021-06-27 01:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7da586ece72d47e0d1e7684b1b9ee830 SHA-1: 3ee078e42b4332284a5ddbeac79c62a1656537dc SHA-256: ecf9f55fc406c27546a496c9d0a851f297ef1af57d6f75c18c950bd5c5673f0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites used for hosting files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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://agentcctv.com/userfiles/file/7582587415.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160773dfd0ed13---xokogolukijonosapis.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c315dc05f39---pipatavexoforujakebuvadu.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f023a6fa56---44204606906.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/tsgt84nodmdbng7ba7mrebft8u/xufumemaxofogidimibe.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6162559e51---wutovuvalu.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22f5e1e37---bazagodupoluzorinulilu.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a99941954---96002831787.pdf
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/teluwibunesumotowe.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc884c008---73950453266.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c67bd37bf96---89336975970.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/4150580720c9a6ec2a812f04d0903cac/56988356190.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8caaa71aaa---24802755354.pdf
    • https://ksboutlet.com/file/files/13583447538.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/eb209b284b6ca9bb4b7c1abdb1b48d54/66124147321.pdf
    • http://mt-filtration.com/uploaded/file/134770753660d7a236688b0.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949e3527753---70045275973.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/o8sep451r4ucnhodgo0gnt178v/62648604848.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/790a1954c2f854d9cca2937545e47012/votuwovo.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9b78f0ed3---66355334179.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b98409a8---56711565858.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/856onju5rn6515b5avrimuge95/parixonozoj.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/tddb4d5oqp8a5g2m81akqocvi2/watojorurexapepegoli.pdf
    • https://rowadalbyt.com/userfiles/files/69076087114.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+the+difference+between+pdf+and+epub
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001473a.bin
93a99ad090585e217b954d0ec84d9502a30c33f837040caad5afcbba66f8e5c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1473A 10872 bytes
font_01_sfnt_off0001601f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1601F 16792 bytes
font_02_sfnt_off0001782c.bin
c02345c7cd7d7facf59c615f93af4f688008babdd80438e9e891ae1d52b0b981		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1782C 3000 bytes
font_03_sfnt_off00018480.bin
91f789ec1a2c0b645fd94b1b1a88a520475ae76dec5ff141de0b387c5c3d96e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18480 19232 bytes

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