Malicious PDF — malware analysis report

Static analysis result for SHA-256 c313dbb50abe7596…

MALICIOUS

PDF

86.2 KB Created: 2021-06-28 07:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e684a5013b7c3468655d1ddbc647ded SHA-1: 3959dae8aab4180726da5feeb821e6c484b93678 SHA-256: c313dbb50abe759691b4b32fe4d7483a477b11771082320d08f1092bfb6cd0ac
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious. It contains a large number of links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://armandofalconi.net/userfiles/file/61290976142.pdf
    • https://ocw.tw/uploads/files/kinorobarozuwasesazesazot.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/80568779165.pdf
    • http://weberstellen.ch/userfiles/file/lifisujugipafi.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/drqfrlm0loekh4bnoph45usfs4/61085424922.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088740a6e1a4---vasinorejukazufedarajukad.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737425b905b---77772120706.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608a39c700ec4---80127246781.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160730bb42cb0f---43898033383.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/a4bd99c662db4fca0e13d6dd6af0d436/43458576831.pdf
    • http://ahchala.com/img/file/vonetopumodimoboxiritu.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c379fc3341a---gudexegiwidafemasi.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160943b8b7e24d---vivovomanadidup.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a9c748cd3---36974997316.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095549fd3c55---78158130177.pdf
    • http://fine-cottage.ru/userfiles/files/52571725695.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3377edd62---62492885823.pdf
    • https://classconnbio.com/img-jacson/files/pudowevinivakevoxit.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/a4400c6aebdb971e1dff8c143a8e7c06/89518454689.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a3009240c6e---47932700477.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608c58c3429d6---25063830987.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/14889853762.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/fadb040ae4023f9a288730a877071545/1705507871.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=one+piece+film+strong+world+movie
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f039.bin
fdf667230fbb375f2ba9a563f4ba21fef5941f7fb5a3e23d94009b7b6df936d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 16672 bytes
font_01_sfnt_off00011b6d.bin
1803632995eceea5aacd7a3736b1feb00eef5e09c93ad9b1416ef2dc243c0e82
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6D 10976 bytes
font_02_sfnt_off000134c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134C4 16792 bytes