Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d7390f5c24e52a…

MALICIOUS

PDF

69.7 KB Created: 2021-09-01 00:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb0850318e8aef209b71c8350336bbce SHA-1: 5fd7724cf1f311b1e97edbbb8f1eb7523616ce58 SHA-256: 19d7390f5c24e52acd3d8d9645d2c802cad67335819cc9596a23a6782a4f72bf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate that the document functions as a link farm, likely intended to redirect users to malicious websites for phishing or other malicious activities. The presence of compromised CMS upload links further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=online+pdf+to+word+c PDF link annotation
    • http://phdpecs.hu/userfiles/files/7201754373.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/lerisakapukulikuxuwulas.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9d88221cf---69246072306.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021081623355091.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/regedexodegavojezapi.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610df97c100af---dipif.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2a8fb84fd7f8656a492a6f026d800a96/41990907291.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///fikadagakujowamawugaru.pdfIn PDF document text
    • http://js-space.de/userfiles/file/xajuxekenaguzipik.pdfIn PDF document text
    • http://metapolar.hu/tmp/97676151220.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16108a7e28e10a---27004809733.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/a2cbd753760d76fd81d908a1d32da8b5/bawukotevo.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/33565493662.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/zejapubolugabegufomerawov.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/munexevigiz.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/milutenuxozipew.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/2944561824.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/54654651412.pdfIn PDF document text
    • https://kermanrooz.com/img/files/55104674920.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/6411135683.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/fanuriwuponovewupujo.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/28817851330.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610b06ac5b214---40442022187.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_off0000b38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA6 10392 bytes
SHA-256: d5de1b9d6813b1340ef33cf10e07939ca536fb2b37a13ef97285073054e8f877
font_02_sfnt_off0000e34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34F 15152 bytes
SHA-256: 8b560ee1eaeacbe69459b324583a087cd58920b6c91beae8c81b062dc5f8c66b