Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ca672e84422839…

MALICIOUS

PDF

86.8 KB Created: 2021-08-18 10:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 16d345381e85bcf6323816c3cd9300d4 SHA-1: eb0253153f796be637c51af1a8f504eac0f7066c SHA-256: 82ca672e84422839e5ebc70e274814ae6452c5999f97fc0a81f8c2f9422dcf09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites and potentially disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites, likely disguised as search results or file downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://huntic.ru/uplcv?utm_term=maytag+5000+series+washer+with+steam+price PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b1e5db2a7---75315589905.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/6755501777.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/71880789741.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/3mjem3njg53of6fupssr1qmj5n/makujosifelex.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qt6uaaje188cgk2708lfehbed3/kutumagoganizubivikupeji.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/84681810744.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609f217cdb61f---14283542605.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/nuwerapuka.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/6312487910.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1611a1d6ba24b8---vepipenetijamimo.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/sezivaxos.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/71999870077.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/19117612250.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/tedolabo.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/hviko3messjhjqdvmvpb2fnmcl/mosugobarolorufadujuwi.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/kenapijagerenivegefumos.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/84606992665.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/74bca47c39a3672d92443cff73379aa5/52423110939.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/7192885823.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/82133185741.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d663467e---bulag.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f702812bf8---famev.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c88bf79d17---22146013118.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/99994486582.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/kozosuvodutujoduzibovutu.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_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 11000 bytes
SHA-256: f7536f665944904bb8ad920734587202830c50423eca304bd5911ae43e354158
font_01_sfnt_off00010817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12029 17120 bytes
SHA-256: b551ef2c3f26c01cb3b9782dd94f1dc8983a1f66ff445127827b91ccb704ff56