Malicious PDF — malware analysis report

Static analysis result for SHA-256 7130542d873b4e63…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 13:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4177955181d20be7933a8682d300222f SHA-1: 7ff820db1a4ac4fb5d87a9ce4c7cdaef9168d6b0 SHA-256: 7130542d873b4e6319b115c4b527ce17c8dec1f1f67da52b0257196b2977d986
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://synerhu.ru/uplcv?utm_term=lyrics+better+in+time+by+leona+lewis PDF link annotation
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc5555f336---navudogidowijeduga.pdfIn PDF document text
    • http://omni-links-europe.com/86490598024.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a5c3d9200144ce99a33f321cc0ae7e52/gizurifu.pdfIn PDF document text
    • https://digireg.cn/upload/vunexowomumexugimiseba.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/7993601387.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/49341691194.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/86174850067.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/965951981.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/d63118a7b1fb42fa04c95b0e3a8324e5/28556888883.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b7b4275b6---64841539887.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/167b3703b588662101ba2525231f3de0/fekizuvavapak.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5faf025c9d---pixoropuzafonojavet.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/sanubijiveretogelugerefak.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/5srgkpq5n2m3u3gtovl8aeev03/kakanaradan.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161285386837b0---valalulavozel.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/60709636820.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/kitajo.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210829160654.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/41632037950.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/dd78541e66f84deba0e45ccb4702f9d4/gotazaruwowifenuwiz.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082ef464c702---43063982966.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1b9898861---gibokawelalegozusasoni.pdfIn PDF document text
    • 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_off0000cfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDD 10688 bytes
SHA-256: c420bf8f44f599603a1a73fb4b16994c7fbcd88279e88d80ab7b4106e33d1b70
font_01_sfnt_off0000e873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10085 16868 bytes
SHA-256: c5f0093e2e5a64d7b12f8132169eea3fdcc528b150f29b9571c82e59757eb692

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