Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1fce9b5afc03e9…

MALICIOUS

PDF

93.4 KB Created: 2021-09-16 22:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 301c884e760f54a15e1a85bf49a517d5 SHA-1: a0c53e94ea189e43a46868773852b40f284de173 SHA-256: ea1fce9b5afc03e942e6b3503e729a799a822a4e60a77dbb2d8a90608d81ca3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of `utm_term` parameters suggests an attempt to track user engagement with potentially malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://infrive.ru/uplcv?utm_term=extreme+car+simulator+mod+apk+download PDF link annotation
    • https://deshpanday.com/ckfinder/userfiles/files/9592449832.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/14449515687.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/53511468753.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/pazusobonavabewimebemegi.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16137f202e6e9c---renixezunosulex.pdfIn PDF document text
    • http://vodova51-53.cz/files/78276100791.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161434dde3c707---7530566143.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/7243848945.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/80085517411.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/10128493204.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/nimepixilusowerogelixo.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/28519726767.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/2ef8e781df319034afd9fe7140945d89/62266194865.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/zitawalulixigidikuvaxepuz.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d10fbb95d---93423367628.pdfIn PDF document text
    • http://rrarental.org/upload/file/81551883229.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/17123292908.pdfIn PDF document text
    • http://robbes.nl/media/files/kigagapigobafafor.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/89619043130.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/93791866956.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630528370.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/wijalogurodenepovex.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/jezorirogelomezavor.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000e2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AD 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off0000f89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 11040 bytes
SHA-256: 064a01f86f0b4759b67e4a07233167984ce83e6f6a7d2f39cf0108d0bf811633
font_04_sfnt_off00012a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6D 23596 bytes
SHA-256: a071a893768a1be1808ffffcc2c7330a79980d262158c689954f485f88574fe9