Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d7b26a6bafc488…

MALICIOUS

PDF

79.1 KB Created: 2021-08-27 21:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ee71034d04f320e177dbcb4d1d8c463f SHA-1: 9137ec1bc34983897103894eb120980c12c63312 SHA-256: c5d7b26a6bafc488a26a38c15336c7949cc6c12801628f8d7ab293a21904284e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://liur-krd.ru/userfiles/file/84571364745.pdf In PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16114016457cf4---15408027216.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b9db96f80---xekesefugelebuxopegota.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/30111560084.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/wosugofajonizotetera.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/3h7rnoq3cn5ihsksqf00gtk2k7/vabiremifez.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/90645489953.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0e4a6092434ee8d7c860349b4a0e15c2/51997835916.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b913f61ab0---10343023043.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/13277146211.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5539cee51---mipozibagovan.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/91700269820.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/zejugusevefexefugamegu.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/rozaxivuxawite.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082d3f483b18---81031674270.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/34737488511.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/43543759395.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/wafosogivedigomapubajo.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/4595122978.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16219880940998.pdfIn PDF document text
    • https://sealskinz.ru/files/file/sawirumoruwetorubi.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/gasimezidexorotemolu.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/xurarobosipiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=political+affiliation+meaningPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AA 10412 bytes
SHA-256: 3533dfdd725874242a1f27503008a593010871747400fd4607b436321400228c
font_01_sfnt_off0000eb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001034e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034E 16744 bytes
SHA-256: 352c8819c5c9fe15edb9c4ca6a79e5f5804f0868178229f571b10904218af95c

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