Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e73aaba5f734d3…

MALICIOUS

PDF

88.3 KB Created: 2021-09-03 03:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33b3f7909feb0a627b4ff40651d1913b SHA-1: b16d0c7cb908af037365b07571b52e8eb1807ffa SHA-256: 18e73aaba5f734d34bd6c9753bb82fa9d5085baedbacefbf3d2de1dd18b846c1
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and compromised CMS upload links indicates an attempt to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=corian+color+chart+pdf PDF link annotation
    • http://benetalent.com/upload/files/4831354411.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8f819e1ae---11068079491.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/zenizusumebij.pdfIn PDF document text
    • http://midel.me/userfiles/file/momobetiwutopabopexip.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/10626408962.pdfIn PDF document text
    • https://tuinvandecruys.be/file/sivafiw.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990a0067f2e---24052021246.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210811060108.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/iecnnl43gme7em3gsgqc3te1gv/27457047756.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b986124c---75658286094.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/400e0b8b306f5eb1380f32aa528f8414/xatojobavewu.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/6839091686.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/7d5b35ca96c00ebf09dfb435a3fd9306/nawofimamitiza.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/9e3f4f62a652fd1a1fcbc4cc17efec6a/tuxadejonesumapuja.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a28c75b7d---gobawunajireluk.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/80c751622503509f20f7e7e1904d75a9/68787793270.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/3c75060358288a096a9774228f10f9dd/nekomu.pdfIn PDF document text
    • http://rafaelokazakov.com/file/nopuxepiwux.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/e5htnokpi4bj5rk0r79qhsb5fj/tokukedon.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/madawefevixapeje.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/figawivagiwodegib.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/xofefopatufaxikusunu.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa1cf35dca---45838203782.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_off0000f558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF558 10448 bytes
SHA-256: b17a17f816eb34a8b7277ed39da5d057f1c254d42e8ee74f94aae814387069ca
font_01_sfnt_off00010cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12503 17840 bytes
SHA-256: 2fb4137b5cf8e4d603fc92f864e2601b9f8f9a8d303cb0970945436d3d25b1f9

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