Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe0fc55bfa1b9ec…

MALICIOUS

PDF

80.1 KB Created: 2021-07-25 16:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ffe89014450e573d14a25816813a41a3 SHA-1: 63a14733381b3ed17cee5665f3fba9911469b7aa SHA-256: cbe0fc55bfa1b9ecb1855af352f75f65566bbb9284fbec9ca51d5defee63f5c0
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. 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 0.9944

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://kaptenhoki.com/contents//files/fusapipomux.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/45047281472.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/4438920022.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/mewazoxamasulevevuzevi.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/a926a1d0a0ee8a44e2439e4d8939da67/doguxoduxituzufiniwiwised.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/fbf8e2c1ed81ed40a0eff29c55f4aba5/sezeposixabumubi.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/f873aa815a5b309b6f8bc6068196233e/vikaxizopajete.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/43891499501.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/30518165541.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079f3258e23e---rabusamijipenebuzubojajop.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e4729baf1---88816173350.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982ea861fdd---dilavexafewigomaj.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/jokotulo.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/kenetivemewasopaz.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021060915035732.pdfIn PDF document text
    • http://axwelindia.com/uploads/lavibedurozinaxenowito.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39181691967.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/lesisedofazesakavep.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/4b0ht5gg311uur77fs6l7abkac/zilexofun.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/tebakanavojamixosanepari.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/26612959887.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/51290340579.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ad64b2a71---mizen.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/126abe5266a16e38a0c302404e346527/29509271410.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16075aaff3009a---tenilobujuwifatido.pdfIn PDF document text
    • https://amblamy.ee/upload/file/sowobutobupidapukuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=john+deere+310a+backhoe+injector+pumpPDF link annotation
    • 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_off0000d303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD303 17052 bytes
SHA-256: 48219b573d9be64ee28ad944d51439c17241b96c81f219619a454bb98d243b77
font_01_sfnt_off0000ff7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7B 11364 bytes
SHA-256: f6a8d48d52081697713e69a0acc80fbae44bb9386291bacebdafd6c35ea3162e
font_02_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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