Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f6d74da26e57d9…

MALICIOUS

PDF

79.2 KB Created: 2021-09-23 23:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6fa9f81d8a719687e5cdf47d7a5bba2 SHA-1: eabb59fa33f51401054638b603eb41d633f33b52 SHA-256: 82f6d74da26e57d95395978ec058fb9af303ca3a4958f466ad29ae62ffdc29bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The heuristic firings indicate the PDF is acting as a link farm, directing users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=prince+of+persia+epilogue+download PDF link annotation
    • https://menlopark.com/wysiwygfiles/file/desubilejuro.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/22862354222.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/xuzoxino.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/xumojipijeguve.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/39151590300.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/93148433733.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/raxiduvotikuzasikivux.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muzarofozisekag.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/51816762898.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/44670103646.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b465fd155bc3dfc98b7cea98e5ba7b10/timizewupaleroxejawig.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/97160545554.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/90597401443.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/29803032887.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134236626b7a---xukuwuxugogutiwew.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/45658832345.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/toniposufesazepasug.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/zobejof.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/54934130367.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/xuzisowawug.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/12063799373.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85ebcc1ef---73588120113.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210916223048.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/30936949313.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_off0000d0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A3 17460 bytes
SHA-256: 759e190585b485187484d451ae46f414186cd93d86799af6cfac0e5e40eda5ba
font_01_sfnt_off0000fe13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE13 10884 bytes
SHA-256: 8b041177fbe2959dd4623d995afe82a5e304990d14d45d91f80e4957281ee271
font_02_sfnt_off00011730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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