Malicious PDF — malware analysis report

Static analysis result for SHA-256 a205a18d0bf389e8…

MALICIOUS

PDF

87.7 KB Created: 2021-09-13 01:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 03a155c0f163a560dbf3bfd82c988b8a SHA-1: 3736f9faffaea535ccfb73ad904598f96d43b96f SHA-256: a205a18d0bf389e82d9e10363a6542172c49174a6834ae6775f921b4333078b3
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to direct users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=how+can+i+download+playstore+in+laptop PDF link annotation
    • http://jiab.net/userData/board/file/80965728494.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/55564642770.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/47503938615.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/25440865183.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/vorupogaxulidibusenido.pdfIn PDF document text
    • https://bloomeng.com/uploads/zimuzijuji.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/nigufufeg.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/cf6esad1kr1hng4cq441m39nkn/gezozufizeviguja.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/48176500592.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/99088275616.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/podupomebibenufedegidexu.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49794918068.pdfIn PDF document text
    • http://vit-physio.de/file/68725624605.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/pimozolatix.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/pobetosunigoxi.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109120401128565.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/notuvigameb.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/rejat.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/xibunekemezute.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130205925c9d---35272287774.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109091011211369.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/lalolexumexopidusu.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210903_221255.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/jewogobirame.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/59119682066.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/c9e5e3cdd40b993dd15e8abeab1fa2a0/12326989317.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD615 18024 bytes
SHA-256: 027535a2509da5ee5e40df4c033ae726db50fa08aa50a5fb20c7018d8f128a0d
font_01_sfnt_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 10696 bytes
SHA-256: 325c173bedcb2058d4caf05b7b7e8802d47797b91cf3b0ab20a5d574d2f28530
font_02_sfnt_off00010a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 17244 bytes
SHA-256: e87ef6abbf9abbd34b4971a73ce8944be9eabe143e3e84ae5655e65adf463a6c
font_03_sfnt_off000137e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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