Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5dbb5f918a961a7…

MALICIOUS

PDF

74.1 KB Created: 2021-09-08 09:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cb6c4dd8c2c8ddc8448b57ac215c7950 SHA-1: 47b17db2eaaa7c492614857060f088cef1190d2a SHA-256: c5dbb5f918a961a775a51d7ddebf179ed774a4d6d2a86eeeec6d97c368036d02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links are likely used to redirect users to phishing pages or download further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://irlanc.ru/uplcv?utm_term=acr+bi+rads+5th+edition+pdf PDF link annotation
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a3248023004f2c8c002b0d63fbadedc9/paxubazegubibob.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073da035c2cb---90204437463.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/80644948125.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/tt1t7rag4sjcjcvbm6kgbj79l5/wufapogivolofozere.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/degifodukiruxemanoviwu.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/12928847995.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ba29ce0fa2b---fekoli.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/zivozifibarexifumifumar.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/68029716561.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964899b8323---xojumikiwo.pdfIn PDF document text
    • https://estoniapools.com/contents//files/relakoxeraronoxaralesore.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/aee3da65535c58ee30030ccf59d6065f/gozow.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/tizoduxojupa.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609841c1d6f24---35033920721.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45db38f540---kafatitewivarewol.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ad0f0ac58---95766657137.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/vafisujibepinuwidi.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/63808519421.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/fezosikasinujan.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/85357423257.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b287a699933---guxig.pdfIn PDF document text
    • https://begili.com/uploads/image/files/66697893870.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/578df8301b212259f0b2e291d4e8fe33/46843294672.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/11957482160.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/nifilamiloreximivuvej.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095e2433d879---nutesafibo.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_off0000bed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED9 10928 bytes
SHA-256: cc7ebc20b83531d99eb4f4e639266dfc8c867b9d91626289bccaa7e150342553
font_01_sfnt_off0000d7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F7 16568 bytes
SHA-256: b347bb201598c2d3789cd1cefd1b5477b775b0e2a9722e03a644e4de60481ebe
font_02_sfnt_off00010303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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