Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e18cfe0d72a2cf7…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 13:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b49c72274a2e9d0d4aac58688e1fb50 SHA-1: d7cdb750c224de3dbfc04e77200b2c0cdba7b500 SHA-256: 1e18cfe0d72a2cf7a27439a23902ca7726488b8ca17e9b917d360fdaa3a5e414
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Numerous external URLs are embedded within the PDF, suggesting it functions as a link farm or phishing lure. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=the+beast+katee+robert+pdf PDF link annotation
    • http://nemdanangpho.com/uploads/2021-09-06/images/files/vutilizipixilasil.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/19115614141.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf8e60ef12---19967846592.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161417b6f448af---6207375470.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161324d2470287---76221224454.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/kugamikiti.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/4256588878.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/fupaxutojasamuvu.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/24788266055.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/21205967385.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090904111073499.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/44j1ijg95g4hd9cignuhle465s/xonefure.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/silenipetuvepaki.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210904_7E0A6A72C114E9A6.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/petagututoriwevum.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/77219364163.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/voditigiju.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/60903230163.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2649dd2ae050221d407a5e35f6eb33d9/dositisegetijukade.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/xaviworepugetepatafuj.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/13859136777.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/839353c38deaab5d6709cea9a2577af4/wotewudexewetixazanuxavaf.pdfIn PDF document text
    • http://millecolori.it/images/file/wijajubixuwomijuk.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109151644513815.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_off0000d7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 10548 bytes
SHA-256: 1bdbb211d55460339333871af592528bf404a7ce6470479ac79b6b4f5219a02b
font_02_sfnt_off00010812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10812 18176 bytes
SHA-256: 84687fee1afa6fc45e3a3a2d8540ca1e3f1142822197f0edb61538b3ed8a8d04

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