Malicious PDF — malware analysis report

Static analysis result for SHA-256 a597e87ebc439bb0…

MALICIOUS

PDF

79.1 KB Created: 2021-09-27 04:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3604b9000b8a9f5e87d7428229475b50 SHA-1: 395cf66125767e74c656d5e42cab7c77affd8ac2 SHA-256: a597e87ebc439bb07a648aaf129a7edfb52088c599b9fce468515bc52cb4e40c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features a link farm pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=how+can+i+unlock+my+iphone+6 PDF link annotation
    • http://abwvictory.com/uploads/files/90325986038.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a02d12dd8940b467d2592d3ee5c81da/vusidezodixunenuwizoneki.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/vizowizitogorigu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0bd71a77---9021667600.pdfIn PDF document text
    • http://kite-surf.sk/files/32391274137.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/11257758937.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/tifivalefazepavexi.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/83220263061.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/zularefojoju.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bac33001dd---67072747767.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/tidimilomexorilazajuvemu.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/xivimafabiv.pdfIn PDF document text
    • http://hingliltd.com/userfiles/sepobikideju.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/5135331194.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/11223571431.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161407d771a7de---33077803211.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/nunebavenop.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/gepumakijalajijutaworu.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/degubegajeneruvedukafo.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/80241452303.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/54760285175.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a19fa92401---kirixapa.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/83713817745.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_off0000b65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE70 19272 bytes
SHA-256: 8bdf7a32ef995018e4d3f2e3d6d741233f488218e6dedc57c8c5a6aa640db894
font_02_sfnt_off0000fffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_03_sfnt_off000115d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D5 10824 bytes
SHA-256: 68c41137210f28e5513b4dfa1892207100104ea1745a8de2cd0455003ea15950

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