Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd6113c0147c23a…

MALICIOUS

PDF

76.4 KB Created: 2021-09-08 01:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b9644b00e2dfc2e141aecc6dd4b2196 SHA-1: c296ed17bcb58442bf7795873aa68ae103a80149 SHA-256: 6cd6113c0147c23a4737eaadaf3c29d02e034e72260532a6ccf06e8e8e074930
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to malicious content, leveraging a technique often associated with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/19273864016.pdf In PDF document text
    • http://atek-ent.com/upload/file/ketibig.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/2432271845.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/32922769622.pdfIn PDF document text
    • https://adikketiga.com/contents//files/16624949203.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/vofagepusemurebipi.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/63615671964.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/lojibofulotizoluditabaja.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbb61061fd---xotukasenilinisisuwa.pdfIn PDF document text
    • https://activepymes.com/pub/file/betunevofegalidakufejex.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/49581644209.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/potosemoramusazazemoseroz.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/rusifop.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/58441131541.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/729bef39b87bc230f2fd602feb03fd69/levofijiboso.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/267605fb5ab84827363d69b072df3a9d/89309620287.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/qmaerdo7rciknfipmt908am1p4/4207799451.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/jukanajumirijugomi.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/j3bn0omg71mvoc2t0157doeukq/86158899016.pdfIn PDF document text
    • https://novsport.com/content/File/48369861548.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/foloxutitekaserebirabuj.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/56ad5e32f934a933ffe0a8fcd1f9d361/84127048066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=diagnosis+microbiology+pdfPDF 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_off0000c7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 10988 bytes
SHA-256: bed220501ad9c20bcd46532e35aa30b264b5d6fba2e41ee6c935fb844b47a015
font_02_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 17236 bytes
SHA-256: 7b4960ece343cad7fd91822808aca7a4ca0ca8bfe8c964ae0c1dd54ae3b9c723

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