Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0afd811d9aa8af5…

MALICIOUS

PDF

76.1 KB Created: 2021-09-08 12:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 32cc1e86598cd90ddfdad1263ecbb2fd SHA-1: 42bdc419a5c4970de8b7b8a3223cd1b900ba3b87 SHA-256: b0afd811d9aa8af53cc842919b75c670eeb34213b3db0b4be1ba0617ab3e80ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and an ML classifier, and also detected by ClamAV as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other domains, likely intended to lead users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, suggesting it is not meant for direct user interaction but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16c620be4b---kifowomileku.pdf In PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a862372ba44---pelupiwalonokifepujanef.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/78237396969.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/29370388094.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceebef369d---xamigifamuxenaga.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/65486771272.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/84684682756.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7aa734774881e8edda67e3d04eb3f715/gugej.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/sokufetejeteni.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/33099720908.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/e6b6135a606794f120d6103048bfd3e8/30820978114.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/34221496390.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qvhaiq15mf5g37ga4u36tuegpj/52899239950.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/tk64oj3nvf8em87mcq6s10qrbv/lekotesijifi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/570cb79f6e738b286e27ffab632b2a44/60676565057.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/fd63617dbda681104e6b838a91927c31/76526784092.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/guninexowu.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/20954883949.pdfIn PDF document text
    • http://benrassam.com/uploads/files/52915212820.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/84565870813.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/e6b739ce1d514ea5f69a7250906e757e/dikifibip.pdfIn PDF document text
    • http://apsons.eu/files/file/wiwuw.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/favunukimujosepepeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=adding+suffix+er+worksheetPDF 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_off0000c41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41C 17500 bytes
SHA-256: 470df3bf1bde0b82e653d456cbcbea916eefc87616e3478636db97797c55d556
font_01_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 10788 bytes
SHA-256: 7400cc924fd905549f4d8c1dae630d722a402f8ad14a4fa0d97b998524f86f9c
font_02_sfnt_off00010958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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