Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e245bab788e7cf8…

MALICIOUS

PDF

75.7 KB Created: 2021-09-05 01:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb6d3e7e14db07e9a070572fc4269b99 SHA-1: d3b7d9843ce4f01c5f712410d93827da912ed9da SHA-256: 2e245bab788e7cf8f81a7b093fc5efc80d9a621e1f986474632c5bf1fa2df0b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=pound+to+kg+chart+pdf PDF link annotation
    • http://shengnabei.com/uploadfile/file///2021072508192195.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/11f27ee38bc11e0c3ef47d7ff7825a46/samoloni.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/1475955961.pdfIn PDF document text
    • http://tzsunup.com/upload/97592717398.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/kewakejalewera.pdfIn PDF document text
    • http://marketingnews.fr/images/file/91477838461.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/taperajawesitalite.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/bofafoziberubix.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080342b8d090---zibikodudeduvuguwe.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/xexitixalifemam.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/tujobubod.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/28942347848.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090329466092---73199974009.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/818cp8detg1u1puo0htar6oaj6/12557609429.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5dc3d07b74---sazoxanetowuvas.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/nonuretulevoju.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610c11863da70---melaxanefezigo.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/jufifewuruxowenud.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/8871dd250a293dbea6e10b8f15b8c978/sesijopukurebazekuvibiw.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e1aca5b595b---keselimuxinusiboroparan.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ttr7q320plealeo4g4a0t9p9ef/sarirade.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/gapodutawabibaz.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e073492be8da750b5058e87c2bef3139/vokumofojijurunu.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/wejalutek.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/vemetifidej.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d1afd44d3---46679282568.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_off0000c7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F7 10656 bytes
SHA-256: a4157fad286de27a0396ade0f93822c44b5cc8ca581c1ff42361ff16dee86b3e
font_01_sfnt_off0000e01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01F 16128 bytes
SHA-256: 538a154d97af1f9e7baeab123e40cd1eb86d601f64a636a2c0e890bd69fbbf04
font_02_sfnt_off00010978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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