Malicious PDF — malware analysis report

Static analysis result for SHA-256 852e5aa44712a617…

MALICIOUS

PDF

82.7 KB Created: 2021-08-10 08:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c366a538f984fa1abb319d2f4125c0f3 SHA-1: 9a09c1b7b7779fda448d08bd44070442ec1fd62d SHA-256: 852e5aa44712a617752b1aba6e4f977396313eb2cb2d6658a498f916093d8899
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://uforoi.com/app/webroot/uploads/files/xalotawuxo.pdf In PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7cb38f356---ruxupodozosupapuw.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16090a85142d2e---sotowopisudosipam.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210618_C31DBA9FDA160CA1.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/dosamiwasa.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160891cbbd81ab---7541786466.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160946c2d60e73---41234821668.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae06500196a---93395589270.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/19859680863.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/47586363806.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/e143417a3253c3ef42100c0a39df4013/81626590950.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/resaz.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/9984123445.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/88780374724.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/96567159614.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/5fe49e4859c5aa9cde47f8927d562f28/66532530116.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/afujn0pt8k4s46nhhg1bv7e5kl/77202846763.pdfIn PDF document text
    • https://daismene.it/file/88587641483.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/nibomimubuzojetuk.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/573270b496a8786069233d2902294fef/xidilade.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/11322953075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pirates+of+the+caribbean+theme+song+download+bass+boostedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD8 18888 bytes
SHA-256: a5431f759b9f45de8f0449dc5d118928e19712254f883e9e629119dea4a1960e
font_01_sfnt_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 11152 bytes
SHA-256: c2824fd9c28db8a8d6948223e41762bfffbae2877c7ee03d57a691220a37dbc6
font_03_sfnt_off00010df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF8 16976 bytes
SHA-256: c7c1b4c370a5579874f587f00d283b0ff22a7efcdec0eb88fb32e32371b1b615

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