Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c474da8519c49b…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 18:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58c98343569eee9d9e6d66ca9c26d425 SHA-1: da1b3a1e09af88355b67ed288389a40dddfa5b56 SHA-256: 27c474da8519c49b0487b5318ab7b5990d98825e68594e6ee143e42e1c8894b7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites, many of which are hosting further malicious PDF files. This behavior is indicative of a link farm designed to redirect users to malicious content, likely as part of a phishing or malware distribution campaign. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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=upstream+intermediate+b2+companion+pdf PDF link annotation
    • http://nppmaudaha.in/ckfinder/userfiles/files/16804252066.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/gorakotupifogodekad.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/vusilodejorivibomisovar.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/149744ee9be28464a3198dec84e11167/51780082613.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606d446ca6f33---godukutemurape.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161302e0d989af---85458455176.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/nubelufivelula.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59126bd8d---63566414232.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/85122999883.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/97075947750.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sidozejur.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f466db76d---61220435967.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/81580529532.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/riludulawakamolixixex.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/nugutokabenavaxezamonubi.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/06f1f2282f0d29e05d68914b870a8225/49455833622.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/97efb7aad6fce354c3f18240eeecc8ee/54428711067.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/07638f8f234a7ecf3cd02d84b489502d/vagafufe.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1003d01b54---defulujowasapijiwozuxuvi.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/xuzilarul.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ecbd32932---kiwusopujezovotur.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/bb6a91e968242acc75e1c9882d2d8cd8/kulabegawunetedevuxid.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_off0000d2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F2 17072 bytes
SHA-256: 4fe842e90f684e9f3ae396ec855a565c913488061327ed5c380cfb8bcbd84704
font_01_sfnt_off0000ffb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C8 11004 bytes
SHA-256: bd4603ad23487c6090570583573953f74615f7fb1f3ca27c89a95097b8d6d31d

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