Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9092b3143bd7823…

MALICIOUS

PDF

81.4 KB Created: 2021-08-31 00:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8662cbc119635a252ac9a5c1e6e74372 SHA-1: f5d9546e18de318ba7997c38b965813ed1afa69c SHA-256: a9092b3143bd782311f8fad6713babcaa5233830d3a6964dcd62cbb294900149
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains numerous links pointing to compromised websites, specifically WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the PDF likely exploits vulnerabilities or tricks the user into navigating to malicious content, potentially leading to further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=top+10+busiest+airport+in+world PDF link annotation
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/r7q5olng0bjdg5oktgcq8fk12sjards5/vazalefipozamedisazof.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/32855301279.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/15159862796.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/928b99a2f3aa8ee477861a2378be6d68/44501432301.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2e6ec3539756c620f737361ecdc4b07d/46760391991.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160710930658a7---gevasikoj.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c2f2af89f---32678546944.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/69969267333.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/rorelirojuku.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/72599854631.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/jnj8v0cobsne167hqri9a9djd1/nomapenuduvoravemoji.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/sufepujidu.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/51d35565d8bf5f6898f351abb8bf8e3c/suxokelidokudupuvem.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/matezalerizegopapelukuju.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/41bb3d42bd7d76afd819bb6cf3638fc9/moxamexinaxiwow.pdfIn PDF document text
    • http://coffee33.ru/archive/file/25441636635.pdfIn PDF document text
    • https://hiroyoung.com/data/files/ruwunidamobegekepowinu.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/57301ced70502e13029fd44d9627d01d/jodajekanidusevorifegur.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/bigomadevajikirilofane.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f33c3bddb7---nowupemid.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/cba92875935143b1ec915d85c2541172/vufepozowomavenuza.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b302fabc21f---wurisulopalekinogipabiliw.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/tirumodupalejubivaxik.pdfIn PDF document text
    • https://led7.ru/file/46518846330.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_off0000d6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 18564 bytes
SHA-256: 09ff57359921940480597bf4701b8d61d84b809a9d0172c0218de02914d558c5
font_01_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 10848 bytes
SHA-256: 9b2b26779b46e115e2ad5f97144912751419556bd0dcc9c4fdf89564d9746bd4
font_02_sfnt_off00012030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1