Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d7a2c1a6a3e98f…

MALICIOUS

PDF

84.1 KB Created: 2021-06-12 23:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0554f3e702ebf174bddb0b20e0ebb3bc SHA-1: ced8f1e798984c762bc12848e55587582f3c774c SHA-256: c9d7a2c1a6a3e98fa078fdc452c8d37a26ccd887b5c95d1688162829a7533bb3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm designed to distribute further malicious content or phish for information. The presence of embedded URLs and the 'SE_DOWNLOAD_BUTTON' heuristic further support a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=prem+s+mann+introductory+statistics+solutions+pdf PDF link annotation
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/fded3366a2b909a429d912593160e710/12181172599.pdfIn PDF document text
    • http://abc-tel.ru/data/File/xewofajabeneluz.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/vetima.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9beed4f89---21335448300.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/40972345806.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/bd255c1010df8b0530d8f6dacf1c02ba/8329127068.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pub8t9pim78mntfeirs4baor10/56113303154.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace5f04fdf2---pekaji.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37cf2d9d27---55391772267.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a914149c5---13015287458.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/kogibelenetamosudisilofi.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/luxujakezomukuvupugave.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/1efacd13a99c3c9f489d8156cd1bdfb5/35138558089.pdfIn PDF document text
    • https://genegurumiraclehealer.comuserfiles/file/59249392260.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/d50bbf5f273930d908289d57cf631937/19400651881.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn 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_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 5284 bytes
SHA-256: 988ec9278d18c04a144c41b2325a5150ca4d1e245337723a9662b2a824b8ec16
font_01_sfnt_off0000f9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 10868 bytes
SHA-256: d555e5017bebe31d232ac08d0600fc646b2d2bcfc98c00ad72841fa089344d62
font_02_sfnt_off00011f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off00013487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13487 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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