Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc8fe116f33bd58…

MALICIOUS

PDF

117.1 KB Created: 2021-07-03 02:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 688cb19fd4ae201e684ca6616ad9d343 SHA-1: 091ff37d715a8b4a353fec4f64187adf39966db8 SHA-256: 8cc8fe116f33bd58baf81c7a2016734ba51afb9a8cd0ceb43eb7590a3061c1fb
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the PDF's primary purpose is to facilitate initial access, likely through spearphishing, by directing users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9805

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 https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/e9f1fef6125e5a175f3a6ea71cb5dfe3/3502229160.pdf In PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d431db06---rutesafazebevozofupuvo.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/mepogijuj.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079369a7390a---zisamosuvamuwukagu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160bc02f15a89b---rumonun.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/993d649e6ac691ab5e789293eff71e16/tozediwok.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/82675128467.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/a36361d4078031efafce36ebe0450209/kopaxasokezipitajajejiz.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bab2313105c---jamifamovuvojugoxege.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/najosuporebixurizilixesax.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/5492d44d96636bc2633b0e1bc06b4910/mirukotuxudadokew.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/teridug.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081ee3d7dbd4---nezolubojifivafidex.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/mivitajeb.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098d987bcdac---86287740301.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a85f880c688---38516422336.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160d6bb6cdc356---nexorevekusajuduvewujakew.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/19992589629.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8cdc33a9ac8806b36ee295a0f3ab0c9a/38009186257.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098d10a4c17d---93268236703.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/2ef908b599d493b339f09a670f037587/kokerawesuva.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/33vk39a8c4ekf7riududdi04ti/9606133150.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079229b05da7---damivupikoxixelam.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/woritakurulo.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/85996595191.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a0bdd6ae---8072183285.pdfIn PDF document text
    • http://castanienfamily.com/clients/74558/File/30606511579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=book+13+test+4+reading+answersPDF 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_off000165bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165BF 17844 bytes
SHA-256: de41f9a28ceddf5c1ccb9ce4bda07b31c9f373000aed621689e77d657c322cc5
font_01_sfnt_off000193d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193D2 10912 bytes
SHA-256: d86f3a01bb4a26d0a7b654110a52a3adc0ba865a1f964cb67c26035d0ca042ed
font_02_sfnt_off0001ad3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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