Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9b263b88995d2b…

MALICIOUS

PDF

86.8 KB Created: 2021-09-03 07:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b28dd0db9e8c648758305b87ffeb3b51 SHA-1: 696b8db7e1c288eb2e9a759a908006af11e969e5 SHA-256: 5d9b263b88995d2bad595872696fd823087c7a0f2276864b3ff0206050b6cdca
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://bdnchem.com/upload/files/fimepadimukoke.pdf
    • http://heatherjansch.com/ckfinder/userfiles/files/nanup.pdf
    • http://sendedianqi.com/upload_fck/file/2021-8-24/20210824221842306919.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f240899e4---74771071070.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f4f207bb75e---14118208943.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/gb26bga0e38icjlpdneuvsmkvk/44226315528.pdf
    • http://straub-online.ch/userfiles/files/rugudofuzixufe.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745b54b50e8---7337712500.pdf
    • http://medianet2000.net/amm_prod/image_news_popup/file/52212241746.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ep2qfi8vovd6dd2af64b7piv5c/40539210741.pdf
    • http://msamericapageant.com/clients/873634/File/81274142063.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a15811b41---88515298875.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e39b729e4fa---zamevanaduwutixum.pdf
    • https://mytopics.it/uploads/file/binexin.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83943b6d5---setibuwiluvelefo.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956eca2a8ea---gotazekufumofus.pdf
    • https://condicionamentofisico.com/arquivos/file/26836267679.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/eed5816eb0ebb01e3ecb52f7d965147d/xojonumafepujufugigekoni.pdf
    • http://rbtyutj01.com/userfiles/files/57257056688.pdf
    • https://pisangmanis.com/contents/files/70634473963.pdf
    • https://larrialdiak.es/files/galeria/files/57597883717.pdf
    • https://nhorizontours.com/userfiles/files/fitopazesovatib.pdf
    • http://ambvetfanini.eu/userfiles/files/wuteno.pdf
    • http://softwarefactory.nl/images/file/96055630089.pdf
    • http://banglenhospital.com/UserFiles/File/felirapezonedoxugo.pdf
    • https://hizlipin.com/calisma2/files/uploads/5359561954.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=preterito+perfecto+y+indefinido+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e97a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 16792 bytes
font_01_sfnt_off0001018c.bin
8112513e15be36b64cdccc1298313077c445941506db7fc9dcaf36c8ac5838f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 20652 bytes
font_02_sfnt_off000135cf.bin
f1adda64ef1691bae0d4fc834cc3bc6870724cc9ac27579f0c7a507d731d500d
pdf-font-stream PDF embedded font (sfnt) at offset 0x135CF 10352 bytes