Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cffdf9678a85610…

MALICIOUS

PDF

84.6 KB Created: 2021-08-21 14:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3948647ee3ccd92a2020581ee1985612 SHA-1: c10e033578db3cdac056644681e247c111bff7fd SHA-256: 4cffdf9678a85610a15781686f68155319b862cb2853cb187ca07019ff208e03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=chandni+chowk+to+china+full+movie+watch+online+movies.com.pk PDF link annotation
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e70625d24---dogizaxezab.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-30/20210430132109842875.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/benezaverapowud.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/9e0b247260fefde4f0f25b50c816ff72/42513257142.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3424acda8974b49ad316de8fb09b3419/jodunekaf.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/19aa6a36c2785114d457f00902596ac7/xawazega.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/papovujupitagogokumumimug.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/rokatemasidobexevumasola.pdfIn PDF document text
    • http://brukbet.com/user_images/file/wodemuzazumukopiwakexibem.pdfIn PDF document text
    • http://christopherdallo.com/file/gipuga.pdfIn PDF document text
    • http://sartor.ru/upload/files/98111229844.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/3398259450.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/dunebadekelom.pdfIn PDF document text
    • http://www.toptehnik.si/images/35004053627.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b585c12ac2b---77423166770.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e0f88a54---rigizuzovipukevokakefe.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dadcf060d46---67691285309.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/17194222931.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/93329270b20bb7cbf3fce951a0834735/tapawifadoxe.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/47967380288.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0477007d---73334523817.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610005a905087---poxisefudoj.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/xexafofefuwiponowazem.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/31095932004.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbd2a34014---9970675988.pdfIn PDF document text
    • 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_off0000e475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 16840 bytes
SHA-256: f313885663cc8a9895bf15ecf96c2d39d5dae0b48d73c60f4383fb4549add49b
font_02_sfnt_off00012860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12860 11228 bytes
SHA-256: dd06b5e2ab204a3a4d030a0379ec266005419bd2618dcddf475b080fb6a53422

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