Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ba662a1bc35b55…

MALICIOUS

PDF

89.6 KB Created: 2021-09-07 09:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4e05e37e2155069d5c54cfcf7cc20cef SHA-1: 4ed941f98584f5d55ea777ceeadcc375c5bfa91c SHA-256: 95ba662a1bc35b55ad4f417ff3c7866d0c064c08cd759b7106e6526566146c28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS upload storage, suggesting an attempt to host malicious content or redirect users. The presence of external URIs and link farms indicates a likely phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://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://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_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
font_02_sfnt_off00014093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1