Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94219e4a07472c9…

MALICIOUS

PDF

75.1 KB Created: 2021-09-20 12:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e658909c4eb0b2e1d973c6e076f06f2 SHA-1: b2517ac32847a1607797fa026ffede1715dc4b21 SHA-256: b94219e4a07472c99a229c3d2419500d22c5b81fd6c8fd850fd00d6f83938c63
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple external URIs, including those pointing to compromised CMS uploads and link farms on disposable hosting, strongly suggests a phishing or malware distribution attempt. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.sun-green.eu/ckfinder/userfiles/files/wazirinokamaf.pdf In PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a238fca118---19436036840.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/41207688884.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/8621249816.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/sexuxefukukos.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/vesowopamirubewud.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/46539389349.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/kejus.pdfIn PDF document text
    • http://laguna.piyawatgroup.com/images/files/litejoparadekebif.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/21251993634.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-2/20210902120240739664.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/8878203722.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/21390867583.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/21419501964.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/48508690563.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/45341253107.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/mobanamuguveba.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/5545275400.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/92101215592.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/metumijexesafumena.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/sebukaveki.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613163053beab---1562386965.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134e4802282f---62849840381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=apk+cleo+gta+sa+androidPDF 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_off0000bfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FA 10760 bytes
SHA-256: 1f493260a112bc3475061a1ce72724122e8e6711c0ed7b0d8c2ea0a3ec2f1f01
font_02_sfnt_off0000f0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B5 17628 bytes
SHA-256: be7f1d60dc3de04250c634c5b685dd150089f802550cf74f21501174f3bbd44e