Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda107b5b77246bf…

MALICIOUS

PDF

79.4 KB Created: 2021-08-13 19:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1a80acb46f1a0a03b3ee01787ef1414b SHA-1: eb923354b73ecc7f91f7e66d7e65d7e8ac9816d8 SHA-256: bda107b5b77246bf9c81498cb36aa1138e0a3b074d0c257ab122d384fede8b89
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or exploit vulnerabilities. The presence of multiple external URIs and a link farm structure supports a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://sikanderajam.com/Robinson/ckfinder/userfiles/files/367276800.pdf In PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e64504bf7b---regevurabi.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/93870040440.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/sd485m288g7urgu69u5uv313p7/kiduxitebegagutipob.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/rujam.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fb8e1dd6a---lemogovenosovofezisunasu.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/aa1766f085ee3f5a306bcffdbc9a0880/40288442907.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/lopus.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/d84om97frs96ip25g3v47ag872/jawivenujupux.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nalean2f4nuj7ljluoadfn9ir7/86299210536.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/54219967571.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160763f28791f9---dizogadetujit.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/74566189017.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/tuwakovezalemejudox.pdfIn PDF document text
    • http://ahchala.com/img/file/fuwegatomer.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095f0cad7415---31361018006.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0b809d0ec---tezuwiwozutitubanizam.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/25700487716.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/53sd8tg3rlirdk51bie509c9is/kolugiru.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace9fb9d5c0---9937469694.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/posewafadakikesesoduvo.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76301988918.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/5061917954.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa90084a3a1---pipurudodewuxutilara.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/92259303411.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/069280e9161e5f8ecb1d48e1835a00a9/99606302149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=tactics+for+toeic+listening+and+reading+test+1+2+oxford+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF35 11032 bytes
SHA-256: af7519833d001ce12f7e0c628c7026de1909244fa5656ed0d7715c946dbb7bdb
font_01_sfnt_off0000e8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 17924 bytes
SHA-256: 551009c7dd7a126bec78446a8756e8f4b7e0313991c4f492c73d1a75debd936b
font_02_sfnt_off0001167e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1