Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7d7bd3c82065f9…

MALICIOUS

PDF

83.0 KB Created: 2021-08-23 09:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c1d6f8f596fa2e934865c6663e596fa3 SHA-1: ce362ad78b9dafcef7eca6109e6be94b70bd701a SHA-256: 8b7d7bd3c82065f95c75425622d998530595c0f6c5945c07a2989e5d33692b02
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The file's structure as a link farm suggests an attempt to distribute traffic or manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/db03agh7cam5qsk5thfm3clabn/rowovetumipe.pdf In PDF document text
    • https://skvely-kup.cz/files/file/dowosan.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/zasaxodizizelagi.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/665118e9b2b96d9147208b1939d70e1c/45987384753.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/sules.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/pepasifisotexokipetaw.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/8vfpg2kvcvnc1pm5fktev4cnpe/pixuboku.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/jelolixoxovile.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd0ebb1b96---97908423948.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/damupino.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608820a49177d---vaxawaw.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ad74875ddf3270d024b2a603fa4bfba2/gesevokani.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/9746989599.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/loxekimukoxuwajoru.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac66c372c99---fitabow.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/80537718566.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/tujid.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/42cdi0elc94uusp4337gfoka7e/mowexitumejigoguzu.pdfIn PDF document text
    • https://nasikampung.info/contents//files/wumitewazalodabixidoroji.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/notizetob.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a1520d315fb---meniveki.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/47405379780.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210710111102.pdfIn PDF document text
    • http://zerosquareonline.com/file/nanezovoxepufiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=anchor+and+hope+wellingPDF link annotation
    • 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_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 10596 bytes
SHA-256: 43d449483a3e0034bfbceebf23d569e14f1029c5ec77f2a2f394d5dd6aab22fd
font_01_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 16940 bytes
SHA-256: c34fc7db687aeb6d4b218361a4bbc3ddafe7b7a7cc4211e4272874e013164fb1
font_02_sfnt_off00012612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1