Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7503ade7c8fa7a…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 20:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 07e560765ae9130eb222516c8ac91ec5 SHA-1: 3826d2584ebcb39d9d987d5a9c796510394b4fd2 SHA-256: 6a7503ade7c8fa7a875a5cf990c982bbe977bda138139ed4a9d0019057b8169d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. The embedded URLs and the heuristic firings for link farms and compromised CMS uploads support this assessment.

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://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141d69a82e67---dovuraj.pdf In PDF document text
    • http://humanlitech.com/files/files/32280520364.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j44tqd3mj762lj22d2379is8n4/55838661210.pdfIn PDF document text
    • http://budka39.ru/files/60308958811.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/74986597748.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/32877841076.pdfIn PDF document text
    • http://rinsacars.com/files/others/fesajefekuka.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/rokufokewusagilewan.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/38034267557.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/sokavubofaman.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/70080231198.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92062708264.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/jqn3ti9u8pb8aq8bd2pohatou0/somovojejivawoxinula.pdfIn PDF document text
    • http://dolonchem.com/upload/files/bixipogolesasi.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/21982891632.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/2202376942.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/43458920773.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/7126766132.pdfIn PDF document text
    • https://amgaa.org/temp/files/nukiburewo.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kutimuziveb.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/95ff526409e7c5ff609b12a2addc7f35/29713884719.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/xokiwakajeveziwebes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+mod+jetpack+joyridePDF 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_off0000c90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90D 10928 bytes
SHA-256: 1c50c3fb066da4414d36c9516c7ca4371bfd45436bb5a3003c1b3f5c20be6597
font_01_sfnt_off0000e258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 16524 bytes
SHA-256: 959fefa91d4fd11ffc8c1db0831a88b79571d7a1d697545b0226b64d2e0f635a
font_02_sfnt_off00010cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1