Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b72b10e8324f203…

MALICIOUS

PDF

79.5 KB Created: 2021-06-27 00:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9d3249626d09f98cd17f7ef4689351c0 SHA-1: 893ad8b9f82a3d7dc2b3eb36c9808e4d1c0e61a4 SHA-256: 8b72b10e8324f203276d44ab85e82394e6227fd51e73e7081bdcb3b6e6d6ba7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://transcash.com/ci/userfiles/files/bebagetijubozuvenepeven.pdf In PDF document text
    • https://sedefartphotography.com/resimler/files/29185075320.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/aaeee36b243b989e6f21e60756692f9e/kowuzuranuzejutebalon.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ufufegikume.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705c15ee5e1---pukenuzimirawekikeja.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/998e652bfaaffa43f769bbddac74c07b/23365112015.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/69914650916.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/802b9cf0a242cba44a385040d90da0c6/tutewaxerilevejefasin.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841a8335f0d---bopolejezo.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/58726057112.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57f6f5f2c2---sunejubajixemanaxisu.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/1b972c72215f9caa816c395ac36e8926/wakimivumusenapomer.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60aea00849---fidefonax.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085441c709c9---vezesap.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160999ff90b883---ketija.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/d94c59e62632b9113f2203a41eeeb6e2/62178744204.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46dea8d4bb---faxipomofukamisamusatut.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1938f19a41---toxasujafudi.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/donudumeromef.pdfIn PDF document text
    • http://allasclub.com/campannas/file/8837596635.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/67766244724.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/95844040355.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f3abe57c---somigezakisuxesawabow.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/06f00ef92a1fc2f46482de13da8eb340/226160351.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/zamilevubujanefilizuz.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/63240311792.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/mulaxupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fate+meaning+in+tamilPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/20737238114.pdfIn PDF document text
    • 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_off0000d17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17D 19260 bytes
SHA-256: d91e8b1a0e17bb8de14fdd16a02c17e3039cd55d5a095f85f91a8bda018edd56
font_01_sfnt_off00010269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 10040 bytes
SHA-256: bdf24efedc825f7eb10753e221060fa84744b93144be94c333dad3dc12c4c7c2
font_02_sfnt_off000118a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1