Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3c087fce1c1a59…

MALICIOUS

PDF

71.8 KB Created: 2021-09-24 20:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d7f01606097f5630d2c3e30be7c794c7 SHA-1: 3983c81fec4647c57cd7df01515ee3be2d001af9 SHA-256: eb3c087fce1c1a59762e376078b2ffea7ec6561cdf23d862f785a65676f4a480
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

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 http://haisushitogo.com/uploads/files/30691295106.pdf In PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/pegoxinisarelotatus.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/23090578665.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12416628946.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614562970577a---pujalemelugasi.pdfIn PDF document text
    • http://raovat.coi.vn/uploads/userfiles/file/19678604701.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/dedulukojuzegimatimuluxa.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/tovefovabemituv.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/1913206624.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/mapufobokevasuzut.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210907000429496.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/mupopimulejomi.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/refavifubimovugamezutu.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141199086be1---62387175101.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3c661169d---22657532811.pdfIn PDF document text
    • http://slovoveri.org/userfiles/19041002491.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/wetifarivetumejij.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mumum.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/10251702900.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/kefozarigavelaxitavig.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/xulowitutokiwuk.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/75982831237.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/lamos.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/kuvalamenafedezi.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141716455638---42686530123.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/75857859468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=unlock+safe+searchPDF 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_off0000b4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D7 10344 bytes
SHA-256: d4ec6043aae551a2265ad96296b7f39bdf2c8ba70675d7e72b26415695dbad33
font_01_sfnt_off0000cc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC21 17752 bytes
SHA-256: 36d42fe6f6a8c4f37274318e9c810cebc31583bc7e894348bc608b9ea07e17eb
font_02_sfnt_off0000f9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1