Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3dc2123c30ebff2…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 22:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c8de6acd5d82bcd53189a5fde9eeea4 SHA-1: 8e05a40253d4689deda9fd02f4d5295fee3e8643 SHA-256: e3dc2123c30ebff2279e77ff881e5bdd139386b87d9b3b6016b041c1d3e605ee
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to PDF files hosted on various domains, some of which are flagged as potentially compromised or disposable. The primary purpose appears to be distributing or linking to other malicious content, likely through a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://millecolori.it/images/file/tesopowalukubifebarovanop.pdf In PDF document text
    • http://grandviewgroupresort.com/upload/files/buzitatudunov.pdfIn PDF document text
    • http://insei.eu/userfiles/files/fovubinupuxa.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/98736265722.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160859987ba612---keririko.pdfIn PDF document text
    • https://synersys.fr/contenu/file/buvomenevetofotuxobaz.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/luluvasunageki.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/12677532742.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/sakobilaxifarejej.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/kuxoli.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/jozesepurosupupenek.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/sokujijubuvopesiw.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/41172525514.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/674496cd383317af0e49e94d39017b58/71770013118.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4065bc088f845b5eac66a268265708fc/78415419352.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/55655271639.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/47794743163.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/votuzuxavumukuvagumuzona.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/60b6287e023b4eabbfd57427526b3e74/bululajuxunu.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/xulavevetelusunutukaw.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/2b0864d0118d6ee2391a415ffe2e03ab/27582547732.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/774ecde8a30aa580d9156cc7a7bf0f68/rowiguka.pdfIn PDF document text
    • http://e-district.org/userfiles/file/70414479481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=masterpieces+for+marimba+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_off0000d09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 16964 bytes
SHA-256: 66c45fe3a36b67d5e0e8065d6bb0857ae25c74fe10b9f88d232896e80fcd894a
font_02_sfnt_off000114c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C8 10764 bytes
SHA-256: db51a4c3e57183ae27d9931142c8c04b2d8e535548a6bb5876d8f73942888455

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