Malicious PDF — malware analysis report

Static analysis result for SHA-256 b331da8dd9804d13…

MALICIOUS

PDF

92.8 KB Created: 2021-07-19 21:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33396819a706565caba9e84957d4a0ef SHA-1: 888039f71a117cdd4fba088a79cc3f0b0e507081 SHA-256: b331da8dd9804d13859de8a2b6b57cbaa4d29d5a8ae6c8a910b7bd6aa477e0e3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are designed to lure users into clicking them, potentially leading to further malicious content or downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6bd5056b7---lexoguzomelotamir.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ce8a3121a---39057049199.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/285cc74eb9a4d026b7f98934a1b9e5c7/95728742113.pdf
    • https://zhbiotech.com/CKEdit/upload/files/xinikenobolidelukabimat.pdf
    • https://icfas.net/icfas_new/dev/ckfinder/userfiles/files/vutesaji.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/85fb115c79c43bbae4dea11ef3151690/84967507747.pdf
    • https://www.passion-rnd.com/upfile/files/2021/07/02/57913168532.pdf
    • https://alnahamgroup.com/userfiles/file/97162485911.pdf
    • http://rotarycochinharbour.org/ci/userfiles/files/81708283808.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99a56af432---99280093429.pdf
    • http://scamps.biz/userfiles/file/nasefabasozojeromupixonuw.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e6744b7b817a27d227a69636092cea37/sapopeguliduwafen.pdf
    • https://vicotelecom.vn/static/source/images/file/lasubenasum.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/054fc7b875c41ae1e375ffc5528203a5/49837339944.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e287e95eb87aeb1c813a20995bfcf766/lasebagixazemebenelet.pdf
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/wemelaravusifa.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ea3ae7e8---duxedefimopuvejavawugorub.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/2260b00fe35db5d1102a9f265c1fd8ea/dolamezesozomo.pdf
    • http://indecomavo.pl/inc/3881227494.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/e139df317c9a0c188a776665bc7cf348/44162875661.pdf
    • https://tuttoadomiciliocn.it/file/nusefofufetevolososew.pdf
    • http://qbcar.ru/ckfinder/userfiles/files/59226386105.pdf
    • http://st-ark.it/userfiles/files/takonug.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5f6db5a5bea129f9ca8f04d882f8cbc7/96967631096.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=weight+loss+diet+chart+for+female+in+marathi
    • https://medlineplus.gov/diets.html
    • 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_off000107b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107B2 16792 bytes
font_01_sfnt_off00011fc4.bin
ad24c73e2c5027d0eeb0be8c1fbc2c41d33bb73e76f278e65a6a54e311d5904a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC4 17312 bytes
font_02_sfnt_off00014d08.bin
c4df06427ab579ca50dbc56c985ee4c2fbe2f1311b26a4d0a805dd421cefcab7
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D08 10916 bytes