Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1836e482c6c56b…

MALICIOUS

PDF

84.6 KB Created: 2021-06-28 15:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 73fda18875d37cbe1c512f78565626be SHA-1: 7bb6556938dadc147994a4af869783d8af31811c SHA-256: ca1836e482c6c56bed978c1294782e9a5b98f5b1d5b99a1f0dccafc45b00c38f
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to numerous websites, many hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and a link farm heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://slezanie.eu/userfiles/file/mosevok.pdf In PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607734e35bf72---midetuseribixekazezu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2526f2142e---24652844062.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/14741994849.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/df7fa4071d6ea126b86cf4276099d944/77154205797.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae12fd25c26---46817825886.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/76042685763.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2daea2353---57721830148.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/5ccc0dad6cd058f2b16d93415baacc57/46350426398.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/77835162958.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609665297ec54---gujelizozomeda.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/59307698629.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/qt0pb2fnk4e94033r70ljmda43/pajubolaruxuz.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621313851.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021060307255073499.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608563b2480a3---redifigirusulofipi.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/vamopuxademeripubas.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/69fd4d0d6a20a4ce71bd96030969e394/26206923637.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/d1c7f9cd74c878c4649d8b378e790512/34101190825.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/69a6087dec8051493628d626f2ce7a0b/42042653370.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803436a9d21---28357244816.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/mokotimumirifulezoxuzaw.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/pixosewolatowow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+colors+to+mix+to+get+dark+brownPDF 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_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BA 11228 bytes
SHA-256: dd577b40af4961aa9f1ec8b21139e2edab449d57f52f4f83ef51a29536764d6e
font_02_sfnt_off00011bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBC 16052 bytes
SHA-256: 564d6e44bf60e704ffb9d2753e1e39d617af9afadf1510a1a435f0693beb18dd

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