Malicious PDF — malware analysis report

Static analysis result for SHA-256 4093e90a659c6f36…

MALICIOUS

PDF

116.0 KB Created: 2021-09-02 06:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0239eb1285e66bc9307504032490de07 SHA-1: 8bc0be963b097f2cc589e39d1cdeae800d2b8c72 SHA-256: 4093e90a659c6f3686e258e270ab65d090c0cf66cc1df478a51ba35a907ff7d7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous external links and the overall detection profile points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://manualismedicina.hu/fileok/file/424725707.pdf In PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210818051330.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/bisomavaforun.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/29651922308.pdfIn PDF document text
    • https://zold-kommando.hu/files/38259289637.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160acc8c6c6c68---36014473009.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a436e69186b---wevuwefevegegusobunikotan.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a71c7828ed2---zalinixitukelekatibadupi.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/9f26190869093bacc1e3a4ff309fd233/38943275102.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608433f83aa08---57940393003.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/2417456022.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8ae328ced---3303437820.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/o0kolt5damgtjhja9988t13aa2/nelibozisoduvo.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/dogawekutobifovidaso.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/lekofozeji.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210601012034220.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202108180255202030.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/43363824157.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5fb01440b0---5841814700.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/sofibotorakija.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d316c77add91d736f80da86c9f36cae2/wojob.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/21033182206.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/22472770583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=highest+grossing+indian+movies+2018PDF 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_off00014f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F69 24132 bytes
SHA-256: 9699d2c9903746512a64c6f3fb649b641b27360a70f732d97e97f16395ca4ed7
font_01_sfnt_off00018dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DBB 11208 bytes
SHA-256: 9af7ac3a1dd428a4de0727157943d2cfe132c2447f59503a7def462e146ca5b2
font_02_sfnt_off0001a7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1