Malicious PDF — malware analysis report

Static analysis result for SHA-256 8756f6eb95b92d41…

MALICIOUS

PDF

84.4 KB Created: 2021-08-27 19:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b9df6e7f12af004df1592f78c4b3d1f5 SHA-1: 9106cf9b2483b8a50248f2b46e13f39c9ee39102 SHA-256: 8756f6eb95b92d41d8a7f7c1f312e4d75d15f716592d3a1bf611058ba1185e81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to various domains, some of which appear to be compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ausafe.net/images/art/files/53625947922.pdf In PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e5154c3d5---xotufo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1a4ebbb1---nitisu.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/ragojekixegobezagisa.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611705b4364e5---wejatexa.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/diwolajadidenijikurifobo.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210616_D5163AD0B885B214.pdfIn PDF document text
    • http://kalikraft.com/images/file/puwavugewuwis.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/vixeturazimotadenavuvez.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161146fdca288a---26770091501.pdfIn PDF document text
    • http://elm3rad.com/file/neluk.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/lujarodilozejaziviwori.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/vesubuxesujafezi.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/zufad.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f488b7928fa2a30a920f8452e527dc8c/64830030799.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/wovibiwalawasarepe.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/38416643516.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3619820d---19020734700.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/31312715883.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/74896320270.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/bbb4iu3nb1sil4ot2lnlt5p5km/26159875699.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/62836134213.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/25831055702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=a+song+for+you+sheet+music+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_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 11052 bytes
SHA-256: 993c6c818e509b01ca0cb58d8a332dc3dfa002d5562e439fd548f48ece1addef
font_02_sfnt_off00011326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11326 18508 bytes
SHA-256: 6a3beb5de607747debd1fe269ab1f8f8f62979cc77431a867c710c83969ccd47