Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f4eacd6001f548…

MALICIOUS

PDF

95.5 KB Created: 2021-07-03 02:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23990a4c8ab35f0701721b2b0c7379a1 SHA-1: 9726c0e5465ccd8ead77f614bd3862a73f71f3d7 SHA-256: 82f4eacd6001f5484106b0532a2ba81575f7a30bd87b0f8dbbbc1d339d38b6ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to lure users into clicking malicious links. The presence of multiple distinct hosts and a high number of links suggests a coordinated effort for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160963c3b02b1c---74211671491.pdf In PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/e11a7d4aeaf2c83423a180ecd3774cd0/lanekawonegumigal.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1efddbf33aa75b4eec785e705f95b095/vomox.pdfIn PDF document text
    • https://arerp.kr/data/file///49027146990.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/depesenovo.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/vusabolonibuwe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb9e57250c---roxopiv.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607494f4dfed7---94650868621.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/9db46de21bb684f2e618075e01909d50/71670396089.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/joxugovakubabudujizotajat.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/73ef5306ad371d0cd47ccc26e8da2f4c/58709335062.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160759d0e8a044---sibonetuboduwuxurexebi.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897ecd47785---81707227202.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/57172332104.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160759312e0b2f---33787539093.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/pezogume.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/9507546524.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855fa52994c---51983990737.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab957fb68fc---toxibiburidofewinusijava.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c728fbcd0bc---duzeregidewovipisikixo.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/5hn1uaab503gem3vn0299lsmta/zudum.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607725f9aca41---97103383109.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/61772989562.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/hp4s5spap9qr5jubd14rvblp8m/muxabapi.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/peremubunitujagidodu.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/gagolafopilejusofijikuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+competition+guysPDF 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_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 19764 bytes
SHA-256: 868066c0c83bffcc2fb9967781c40890ad278c271ef2e4bc1236933e408b0fcd
font_01_sfnt_off00014064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14064 10692 bytes
SHA-256: 90f3a2da53d966bd6a3afa2fa006b310b660a471ffb8d13d161b2ada25175c40
font_02_sfnt_off000158c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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