Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b93bae74282b383…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 04:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fa3ffc4b4f0ca6a7df382387b92a66f6 SHA-1: 39f1b6627f55568171e1a1e63687323f8675bc05 SHA-256: 7b93bae74282b3832234c93abfaa7624698b8c0bf6dcdc397de491b8225188fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=interpersonal+skills+definition+pdf PDF link annotation
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969d0a65b3c---vamigusa.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210722031838734.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/j4mbc27v2je078t8oguv13792n/kazodegowopajuzemimusumi.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/fugozomesifujajawalevop.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/6q4vlfuuqu85h9knr8iod5ai66/40302562052.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429022617587542.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/3es8dfl0bbgmdivi738ts7vls7/riwedudunalebulafuxata.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160edba8b4fc55---subul.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/8ba2a235879c1f32530b5cbf13e68066/5467481294.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/89485386247.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a8c83e6269f82c2b2eab9e2a293be229/muvuj.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/javukeromezidufoz.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/99c1qfa2b4o85clnevjh7ilm10/nikubiz.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610ebc784d006---83717769286.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/45590746826.pdfIn PDF document text
    • https://micsys.in/userfiles/file/bulakabonivoli.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/xoxevugadi.pdfIn PDF document text
    • http://dzbnf.com/upload/file///50083664992.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/83110610734.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/zufepuketumulizituduxu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/61074771796.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/37090119233.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/nenituladetusoso.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/nejetuvolitizes.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1bd55ac29---7532080538.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_off0000dfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDA 10536 bytes
SHA-256: dcc0df5039598a8a3775339c81e96854b2c07219a0a1338d3f09750bb5be179b
font_01_sfnt_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 18100 bytes
SHA-256: cd3deb5175647564bbd827e71d3b2cfe156bd82067b9e3069f426f220f60a0f8

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