Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc21f5b00637cee6…

MALICIOUS

PDF

86.1 KB Created: 2021-09-02 01:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 65ae7182b3d989031664ec7116ea6375 SHA-1: 7540091a541a45d710bf087fa75d5b39d837b6e7 SHA-256: dc21f5b00637cee63ff1251501c292ff87e31a8b238d43fafed249da14e26fe7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is unreadable, but the heuristic findings clearly point to a link farm attack pattern.

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://pelicanfinancialnetwork.com/ckfinder/userfiles/files/mironafilunuxi.pdf In PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/wepawipozuremoxeridaxip.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/15680185318a3c04876abce639be21cf/lubibugibakajafe.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/seresekane.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/10799853802.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/70544044668.pdfIn PDF document text
    • https://5udua.com/contents//files/29159896569.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/63b0b64b81b84b4da9bdc21e7fcfbf41/takewezakewikox.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8e9ed13a4---xobanikusezejofimulegof.pdfIn PDF document text
    • http://byecook.com/ckupload/files/21325559876.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/ramakolesiposuzenofujud.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/6a0452ce24f1fb9f2978f5ae04699939/71256117588.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e646117721---33760938137.pdfIn PDF document text
    • http://cochemical.com/upload/files/xisonogenigujexiwaro.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/kuviduriruwawetomiruso.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210815172552.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb11280fe---fibusufanabiweza.pdfIn PDF document text
    • https://aspirans.com/files/file/13660765317.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/24477992954.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/89478f4475ac311f07fe3b5260a6d4f8/50243759312.pdfIn PDF document text
    • http://boxethai38.com/upload/file/37175589374.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/lasubinupifeja.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e88889e2c51bff8e65a39e853f270f0e/dawarir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=characters+for+comic+stripPDF 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_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 17980 bytes
SHA-256: 9413f6c3859cb81273c86916ac86b0b133a40df87ac52b9708e7b5a97eeecc67
font_01_sfnt_off00011a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001323f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323F 10624 bytes
SHA-256: 8b460ebe34311ce2499cac579e5374a865bfde9ac386047854557a3c716eb649

Open this report in the interactive analyzer, or submit your own file for analysis.