Malicious PDF — malware analysis report

Static analysis result for SHA-256 100f1f349447c340…

MALICIOUS

PDF

97.0 KB Created: 2021-06-28 04:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f079483378b71fddc704a2dfc89da5c8 SHA-1: 856ddc4e006433f09031c306288efada7e47b6e5 SHA-256: 100f1f349447c3400878e46c59ad38436eb9a5d66011a68dff660d198348010d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used for phishing or distributing further malware. The presence of external URIs and link farm characteristics strongly supports a malicious document lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://coretry.ru/uplcv?utm_term=abscess+skin+infection PDF link annotation
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89574b351---87768574391.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/xebogomilafajamovita.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160967ad279446---13321325080.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5727567148---56203533066.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4dfa4e897af3a10b699dcb977f3fde7b/sozebisuxifatej.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/nq0m9rbtkj9jl733004qosuls3/telibijosisegis.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/vuvivubukapawaponixazifed.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16083397ca0613---1966748039.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/v3p7cs1c01aqp6ed507vkifm4r/juzogabapizadavuz.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/70579013398.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/694724502ec6bdc54c6a15693777f5d6/22774498276.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700ab7690f4---97687422331.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/pakitelexitokolenose.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52cabae9a2b90deca09ae22583540558/tibulesusutilevorufamola.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/5d1eb08fe0c20e1a55fe0635171418e4/savulolowenowebuviredojiw.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/970f50cb328ecd994aa7cc4aca8332e7/9522784282.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aace6ec6cc3---romifonuxorurewotuzenesa.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d65cc5159c77f5129ae263c38399beaa/feluketoxakudebidum.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/oack0ua3e7ms11rb1ohf4idba2/kijazuzuzevebukes.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160940c9711202---49681704823.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/ketefabekozeruvotujefo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2e9e008c---18253916944.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/65503702860.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/waxofixanutiwubiniwarubi.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dda7b10fc---nawesanitajesino.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_off00011a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3F 17260 bytes
SHA-256: 8a65aeeaecfcc5334debe790656f1b6b63f38c657709625ac75757c1390aeac0
font_01_sfnt_off00014745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14745 10232 bytes
SHA-256: 0b0f3e41e3bfd8dc47a22c61ea3144e4fb61278a14cb483b983b9a247676da2b
font_02_sfnt_off00015e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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