Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4cd57cc0cdf426b…

MALICIOUS

PDF

96.9 KB Created: 2021-07-21 20:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cdd433d704c459d52a9e0ec76372c562 SHA-1: 0f036da71c2d6737089e015fad2172a58fc85d35 SHA-256: f4cd57cc0cdf426b95d561c7eac7f0eb829e31992740b68c114f9b8ac0e062ef
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern appears to be a phishing lure, leveraging these external links to distribute further payloads or collect user information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://newsru.md/upload/userfiles/files/saworuvalawi.pdf In PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/91481866627.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/pejaluzana.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/pobadadadape.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/9476518802.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021717437562824.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fff2495774---kufuzukakubajejovezisaw.pdfIn PDF document text
    • http://khotelmarket.com/FileData/ckfinder/files/20210624_FCEE09147871A810.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/08b630a4494d2cc906665c85dfc79835/66350382445.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/31081655971.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/32662506613.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/sak17tf3p65h1lvh55c71oi701/41952351243.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/mugopol.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aa923474d---67133790770.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/vifilafawufolijolawek.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50b77a14f5---laruna.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/36655058455.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/mizanerevujuteduteresufu.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/22437427843.pdfIn PDF document text
    • http://industrialdevices.in/uploads/68534996533.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f540775a1f8---79084807997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=be+the+change+you+want+to+seePDF 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_off00011930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11930 16904 bytes
SHA-256: e8387cffcc3c20e65fdf78029aa37b69162f0bdaa7fc9ed91ff56670f7b780b4
font_01_sfnt_off0001449b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB2 10624 bytes
SHA-256: 3b3f995a1f6b9bc3f0d0e03f417b907cf07d2e0447d1b2c5212f571d712af19a

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