Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd34ed66b263fab…

MALICIOUS

PDF

95.7 KB Created: 2021-08-03 04:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1768e63dfcf4a2f12088bbc3cad577d4 SHA-1: 54c10dd5303abaef99e283bb9e6631f1d7fb5b0d SHA-256: dbd34ed66b263fab370d0d918d732f2d7ecaca9ea4fb919141309528b92053fb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised infrastructure suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://thanhnhomdinhhinh.net/uploads/files/kavunovodotesekepo.pdf In PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/rebudekawukubewijefabi.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/f79564d6824ead5c88c4726349e37bd6/36476395483.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68fc07e80f---35577915695.pdfIn PDF document text
    • http://aweibel.com/Photo/file/31893252145.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/fea98432a009fc74e9f71c5958c35d1b/84256297467.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/jomesojedidiworoboxix.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c80e321f23bf4e766be2c4a62e472368/garewazunigo.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/61766351869.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/pesufajedufojumidikariked.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e33d19e11729297f77f4f4def337fe1d/81605447164.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/38214784446.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/rufama.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/golabevu.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/de80aa9ccfc676dea29754aae00a540b/37768490900.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea5989ac0d---xubitekam.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/15b0b5959acc2f0d3585466752ffdb66/gexixajos.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e49e6815c3517acb81cef9ec28b72d44/lemunuxa.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/55569899902.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/92625034404.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/66421206348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=avakin+life+mod+apk+unlimited+money+download+latest+versionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 17580 bytes
SHA-256: 61b9ef192180d33fe41cc62bb72b97407ce3ddb94e4b0b333b8b82c544833c47
font_01_sfnt_off000126fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F15 11096 bytes
SHA-256: b647dbfdac3b111c3177130c909bf49d03e4f7de081fef27436d79e812570edd
font_03_sfnt_off00015902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15902 16664 bytes
SHA-256: d240a98b348ad4f217abdd049d2cdd54cd80e99d20ebba4b08d031d70f49324a

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