Malicious PDF — malware analysis report

Static analysis result for SHA-256 0297a8d1a8eb678f…

MALICIOUS

PDF

72.9 KB Created: 2021-10-04 03:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 041fc63b0667a0efdeb7967256b43b05 SHA-1: 7ec8de8ca1c2a7fd1cd74485d82992d8d474373d SHA-256: 0297a8d1a8eb678fdd6cae810ee7262ad5a23b56d3b3b06960c1d98f559e61fa
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It functions as a link farm, hosting numerous URLs that point to potentially compromised websites or disposable hosting, likely to obscure the true malicious destination or for SEO manipulation. The document body is unreadable, but the presence of many external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://archism.ru/uplcv?utm_term=reverse+osmosis+water+treatment+pdf PDF link annotation
    • http://huijingweb.com/upload_fck/file/2021-9-28/20210928093345133897.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161571ecec3390---suwuwiwalitibisuxezet.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210912/files/20210912224420.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/53927612231.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109201851195959.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/jutelawukatevokafe.pdfIn PDF document text
    • https://o-dance.com/upload/files/13501751779.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/38399808166.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ekmov7eh0mrop0bcaqhgod8nm9/nuvenanaxigelowesebe.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156a72653d15---muponefenewagazomesetiz.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/46396324812.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138343a2554a---33428858002.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/letij.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/ninum.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141fb407612c---26488552947.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f7d6c16c30b1070597cc5a033074f891/kiguwodiporasuta.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/13297660489.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/48019418216.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/diwuxakitapure.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/75097229498.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/46bdc581c11e33026540b8d100844785/bewaj.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/74347891514.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/futigesafa.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/dojegamozemo.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/40032165919.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/h3lo3895vito4l0rhmhghpp9nb/tiwibuniwepegixotasix.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_off0000b70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70A 10808 bytes
SHA-256: c4e76df740aeb7b2e2d25a00c24ba084a0ba8768e977fc8e857aae8a08aee1b5
font_01_sfnt_off0000d007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD007 17828 bytes
SHA-256: 081e9b3c4865ccca701dcfd28d45a737a4abeb6a7599d5e96217f1933098be3f
font_02_sfnt_off0000fdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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