Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c378bde2e715671…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 05:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d86f713d85dbf8e4f1762f73023ad59 SHA-1: 8d6bc066de5f011ecb41145f056ef5b01aea8de9 SHA-256: 5c378bde2e7156714128ee267b43547be63c329d67a5dfa04c6902776c791e89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. The primary purpose seems to be directing users to potentially malicious or phishing websites, indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ff0d9343a---fojugerivapedotajuxew.pdf In PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/megatefeviwojekajilip.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/ripovimo.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/14370651164.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/fipumikobepufom.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/gijepexalemub.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/16c804ac57dd040f4580073c974deec7/talunevimixibilani.pdfIn PDF document text
    • https://renault-service.com/userfiles/dajodarekejudoruniwono.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/86950180741.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/jatisukin.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/dagodikovamudivokamud.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/v547gmanpcbphq0ap5t8iqfb9a/xasorezalamarojepugejujet.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/68941461521.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/23483533963.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/74598256146.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/bufepixux.pdfIn PDF document text
    • http://centronegozi.com/public/finivozura.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161398c600432a---68736980335.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/bumodubegifulurobe.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/redunogese.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210912101623.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/90940684235.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210907_135049.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/89dcafdf7214a92f68a0b3122b7736a0/25957254208.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/29923322358.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/56894172320.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/ketugudafijojejalutef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+free+screen+recorder+for+android+without+watermarkPDF 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_off0000e7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CD 11024 bytes
SHA-256: 17472a1fbde6646abeca1e7cfc1ef5339c8baba01dba8618304f20c53fc1b5ae
font_01_sfnt_off0001015b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 18292 bytes
SHA-256: 6bf90f713faa5d1bdf059cabbf377b9bc96839d9cbc7e6e3e5d2b237110f6fd1
font_02_sfnt_off000130f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1