Malicious PDF — malware analysis report

Static analysis result for SHA-256 6349d080af37441f…

MALICIOUS

PDF

84.8 KB Created: 2021-06-29 04:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 345c846a3403228ed14e0cd2b7520eb0 SHA-1: 09452e14cbc30f2acb1576da87d5b6a6d5bc8c2a SHA-256: 6349d080af37441ff32342f0a7cb6a64dc296ededd86cdcfb5f49e037baf6212
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of link farm heuristics suggests an attempt to obscure the ultimate destination or to distribute traffic across multiple compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://asustainable.com/global/file/muluzom.pdf
    • http://farashimirooz.com/files/sapexosaj.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60f10dac70---85751496455.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed1fcc676---sekez.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/b257fc06abddfe6b3ec3d168b35a30a7/23407036491.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d947a2b84d---88844252956.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f17e330d---tamizivoka.pdf
    • http://bright-inter.com/file_media/file_image/file/71319110471.pdf
    • http://sgd42.ru/userfiles/file/32883486814.pdf
    • http://alexhofford.com/temp/files/file/40996806458.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6dcc4b3ce---jajadog.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/m71nn8sda538mivoho4rv3csk9/71254434159.pdf
    • https://netpage.info/userfiles/file/rokopaladidarewinixi.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/20d22639fee216b689d8edcc12715d4c/1205948127.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb7625682f---78639454308.pdf
    • https://apsco.ly/userfiles/files/79341239655.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c217b52130729c31c5415c7e91e390ea/lapaxovuwagajofuruw.pdf
    • http://akinmedical.com/uploads/file/71398142204.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+story+of+the+syrophoenician+woman
    • 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_off0000e8c3.bin
75623e342e281bffa23517fd669322b29fc1e805c66cc9a67f93450ecce05ead		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 10864 bytes
font_01_sfnt_off000101d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 16792 bytes
font_02_sfnt_off000119e8.bin
c06e3f62ecd8d4f5c1f8738425b23aab898cad1580115af9efd631a2c782c20b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119E8 16596 bytes

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