Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93335029cb65f98…

MALICIOUS

PDF

77.2 KB Created: 2021-09-03 14:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a167d5b91f4bb314a086527c0c81186 SHA-1: f84312b5c1ed89e389e19298c45a612ebd778888 SHA-256: c93335029cb65f98412519239be0e04d4d09cc9e879566d338bb5bebfa5384cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, pointing to compromised CMS upload storage and disposable hosting. The embedded URLs, while numerous, do not appear to be directly executable but serve to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b14c63ef0---27494968465.pdf In PDF document text
    • http://masonlegacy.org/clients/61515/File/17071388494.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/sapulavosexejasugubov.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec3484749b---luzifegitimufir.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e56d3bd37---gubuw.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d70ee21161---nebodasafodebawavanozabiv.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/64142103144.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/pijura.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/0a14cf12ed71eaeb1731a1ea237ad39e/9515286529.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609effd6a81fd---domerede.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/jafexe.pdfIn PDF document text
    • https://agermag.ro/mm/file/66579352792.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/musurivamanuweg.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/vibb4fbb34869i764rt5h3ait3/18770337168.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/19941547049.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/bimilasonivagevas.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/76b391b275c2a252285f58e2ff6a5679/75899144399.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fd1f85876---tagodirejidur.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/xiferoze.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9bda7421bc44c5835e4eeecfde7ec8bd/59711588654.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5917ca277---fenesajasubudesokon.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078dc66d8e41---posesoki.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f98a24c28---kisesodabuvowuzi.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/50066762181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=koefisien+determinasi+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_off0000caf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF8 10604 bytes
SHA-256: fd7bc0630e9c7eb0356b957e18167be0f3a69d522716e6ad086bee7625e75a70
font_01_sfnt_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 16732 bytes
SHA-256: 5e0b05a0ab431bd235bf27fb053e592c02c7ff270c9206b5c398a4b947710622

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