Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb65d2ac3ec9e2c0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 09:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2dc4eb28df7a0ac5b4241e3844a3d46b SHA-1: cc0fccdbb2e951186249b7985289c7cf6f425800 SHA-256: fb65d2ac3ec9e2c0381c4bc76bc9e574dc20d16ceb98dd4c86fe8fc17805485c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous PDF files hosted on various domains, some of which appear to be compromised CMS upload directories. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pavillonwohlen.ch/userfiles/files/87202311881.pdf In PDF document text
    • http://accessprecision.com/userfiles/file/90734685917.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a712735f2d2---93118525680.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/xidopijevomidumi.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/24786833478.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/74995301205.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/6f3422d78adf7aaf64c95dcc49484f0c/8079647741.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/womipavawejetena.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160830ed637797---nukuxokaluxisodewomiximes.pdfIn PDF document text
    • http://evansmedia.ca/userfiles/file/95566432438.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/65816105013.pdfIn PDF document text
    • https://limmaginebistrot.com/file/tabazajo.pdfIn PDF document text
    • https://latework.cz/soubory/69375196631.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/0a011e4627585fed53351ce908f47fb4/47972191451.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/6202072309.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/wososuj.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1610d960089616---widigiriwoguzumumukupili.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/kebek.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acd330894a6---tutaka.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ds54qb4oku7utcaaclbcb5qpjl/36913757379.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d212ded1d9b---pesuxe.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16072f2870498e---89489931886.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210726103107.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/tododiferigazijonegowogup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=event+planning+business+proposal+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_off0000ddac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAC 10960 bytes
SHA-256: f185c38e65593ec2ab7fc9f8d177d5bffdd1686a53a7324a0bf7ef78476d35c8
font_01_sfnt_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE0 17088 bytes
SHA-256: 263071a0fba1d3a97f91d2b4908330082c946f03e6c115924cf476a65ebb5a58

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