Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c281c615ae244bd…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 09:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c30389c8eff1816eeb33575f103a756 SHA-1: ea72b2b2e911e5524977574c41110bca94e973ae SHA-256: 6c281c615ae244bdbb08517d528f82636333fa98e5b58f19b721f99395b1dd98
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve to obscure the true malicious destination and evade detection, potentially leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

Heuristics 5

  • 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
  • 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://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceb5b910b9---26839431875.pdf In PDF document text
    • http://contextuae.com/resimler/files/pebojetexesovojolukawuni.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e601dee263495d93462ca80f01597871/rurexiligipiwe.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/8945189136.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/gomuvivebalokezebadum.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/2351633956.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/10449867184.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/tisebumumup.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/56434916444.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/hdcheafl68qo961vk3i05402e9/bojufizusisojovol.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8bffa5626277e27192bd916c986945ba/gudefezo.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/70888095665.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/4299785850.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834f82398be---97910305781.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095793487225---nadaximapijosu.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/606543255704fcfd67547a3435ca3335/sezewudesijukenu.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/19155036318.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/88746816718.pdfIn PDF document text
    • http://xsteelstock.com/d/files/tezuwiwogadorid.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/tubov.pdfIn PDF document text
    • http://tfforming.ru/d/files/67641195991.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/13505308522.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/60685458098.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/94798267143.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9bdf9e0f7---74633655621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=past+simple+vs+present+perfect+simple+exercises+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 10832 bytes
SHA-256: b3874c483ead9dc953a1ecf9be6b5aa37621e9e54ba40b882b3dbc65767b3616
font_01_sfnt_off00010f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 18884 bytes
SHA-256: 12185b04e8f5509a3989357fc2dedfaa831fffb2e6fa077d764ed72262b1d7b8