Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ec5e6650f50896…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 17:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d62a67ef2fff6d1d8cf540c7a0a6bf5 SHA-1: 69639c9b7d2d52f9601baf9cf6cc9ceb314a9576 SHA-256: 42ec5e6650f50896ed4aba3f75e296c35bd22f342a31aa2650ed5fa9d17d524a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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://laborke.ru/uplcv?utm_term=clases+de+espa%C3%B1ol+para+ni%C3%B1os+de+primaria+pdf PDF link annotation
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/et0o96fj9cihe56i6jmlibf3dl/wikigib.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/c4c3240174406331a08faf51207e6ea1/busumatomuzakuraduxiji.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b750dd54d---93545494698.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/sapodapusedefejakonejofez.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/92vqmd517d62asrvjsjngr9iiq/tifaxalofagogenawawiraz.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c731b974043---50244686567.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3b481cd2b19bb548ec5fa13f11f43353/ketogibidigune.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/97mil564it9sfvnud79c7emai6/gunepizopuwi.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/boserq04m7rcg7b1cndrpo8qt4/wapowen.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/391uk34tq86dskobdi1smurc0m/95956822413.pdfIn PDF document text
    • http://usa-ex.com/xarolevimepufifexewiwamok.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/n6sf3dplg1keqd792gmgephag7/78007918748.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/diwuje.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/50g19rnv2rfs33fuf5l9lrnseo/butafizado.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/49472020836.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/sutemezupewujejowat.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/31307444912.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/nedoxesanenov.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/15956097994.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b600b4077---nitugezivomovebafe.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/894bc8813cc7d3c44a87a1a4ccb67624/69530818235.pdfIn PDF document text
    • http://ailizia.com/userfiles/68054432707.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098cdfc36ac0---kudinofibi.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_off0000daf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 10800 bytes
SHA-256: 591a52d298241a54df74bbf1826cd733ccf9cb7beae20600d38e65f44168dee4
font_02_sfnt_off00010b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 18412 bytes
SHA-256: 9c26a9416df7d654409090b43b4ac7ad30c8778b28f354f795e95d3736b43dfe

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