Malicious PDF — malware analysis report

Static analysis result for SHA-256 f833b8deacda1c6f…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 09:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8acf650ceab7f750618e0c2f260071b1 SHA-1: 61cd5146dc5128f82dbf4afb4607ad8962a8437a SHA-256: f833b8deacda1c6fba9f5821ed1cc83142f9b563bb7f3129328d2e133e89f577
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and compromised CMS upload links strongly suggests the document is part of a campaign to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=liqui+moly+manual+transmission+additive PDF link annotation
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098afc278a6a---rinejefe.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e070d324105d5339e02d3db0411f51ed/takamedapifegomewazavi.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/37604708001.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/30098381968.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/webibavewobosuraze.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/74888398711.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd497753cd---pibabuzemox.pdfIn PDF document text
    • http://agama-rc.com/upload/files/gumitidiz.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8a08316a400590edeb3bd7a197062a5d/67496392091.pdfIn PDF document text
    • https://qkon.ca/images/file/nusilegarumemafapowovafo.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c351ae2a49b---wutizuti.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/28509369230.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/mumoroje.pdfIn PDF document text
    • http://serting.eu/userfiles/files/29511519156.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/4lph0dc7o1h5e2u3h8bkla0n87/70304785391.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/52561568847.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/33115676538.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/janurijaxuve.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/52355d4d88f911b7ec9d5e082fe24e3d/lafavivexiwutafegemure.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87afe6ba1b---tivulepenap.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/54628421090.pdfIn PDF document text
    • 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_off0000e049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE049 10792 bytes
SHA-256: cb35bc924d52bb9e10e16d786dfd4f101f8aec7406ac8e2376824671766f8dc7
font_01_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001110c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110C 16372 bytes
SHA-256: ea45c0d3dc9d298f08e22ab1364c8c5a8ac9e8bba8e89677cc10b4c5f995619e

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