Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3a570a07246542…

MALICIOUS

PDF

73.4 KB Created: 2021-10-20 02:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8894cbccd26f2dfff75f376587778917 SHA-1: f758377dc494e451da33afbe5464e4fc1addfe3e SHA-256: 3d3a570a07246542fa087eabd5ac8beac2d73e1a230df32acd10cc27cf588947
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm is a common tactic for directing users to malicious sites, potentially as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dp-engineers.com/admin/userfiles/file/79247148414.pdf In PDF document text
    • http://birizgardenhotel.com/userfiles/file/70518927805.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/4ebf453f2d1000647ef46d9757c033de/67799830495.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/njakc421k1nuuhf2t854gajs39/govonipanugudub.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/lutagujupo.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/gofaleditewebege.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c070eec464---nevowojiwijejizuk.pdfIn PDF document text
    • http://www.puhito.hu/uploads/68908407751.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/sagosubevakutorilep.pdfIn PDF document text
    • http://araratmebel.ru/img/file/noxuvivixele.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-10-13/20211013024915790164.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/97323385430.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/sagobigebenasopojutuliz.pdfIn PDF document text
    • http://allergya.news-read.com/upload/files/gitagebolixupupuxu.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/fawunulat.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/jivusoj.pdfIn PDF document text
    • http://it-hair.com/userfiles/15652004357.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20211010120219.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/natesiwidepapetepa.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/sebokapabavigej.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/1417917533.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/lajawedigizevuvirebas.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/84864673264.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7f60e81bcbfd8b17eca172f594ce57f7/pikeferukaxejawijapes.pdfIn PDF document text
    • https://ebmturonet.progess.com/userfiles/file/39277781435.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/1hHberoKktI/uplcv?utm_term=how+to+reset+innova+3100PDF 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_off0000bdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCB 16132 bytes
SHA-256: 9a48b7e7ac2fe757205a73d0d61163c27e50dbfc4fe1066539232fc69e562246
font_01_sfnt_off0000e799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 10544 bytes
SHA-256: 73da4147b623727c2233824d8e1855a44112c0ec09b003390cc89b4795891d4a
font_02_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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