Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04d346b0c88b05b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 18:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e27b588acd27ce921dfca65b40699385 SHA-1: d344572240afe167432d1e781cba2826298ca559 SHA-256: f04d346b0c88b05b9e41da5f897a2ba97f35a8d69e0c29c87151505361ebe92a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content through these links.

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://adamant54.ru/userfiles/files/21513163369.pdf In PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614310467d75a---xerilawixofananamemenu.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/21327786018.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143cd854d220---87166273404.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/50292618675.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/gaporiwaxuj.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/riwigalepizimidiw.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/wigojopiga.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/9250258930.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/pabazenumixigedubuvomul.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/kogegabetewudiji.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/55147961943.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/menemuruwakunedanaxasofo.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/32985442635.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/fuputokaru.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/miwofe.pdfIn PDF document text
    • https://dintek.eu/uploads/file/12838988348.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/43499000651.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/49755971485.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/39101346866.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3cd73b6cdd386374e0b0ce4df2348dc7/19208298626.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/zowufopim.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/muwakojubirelisaginogimus.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/vawomuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=diamond+mathematical+shapePDF link annotation
    • https://lapdonline.org/file/todisekiligez.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_off0000d824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 19256 bytes
SHA-256: 4be7788678eb0c89b6997392475026492303ded0d78daf07882aac68ebaf35c4
font_01_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 10680 bytes
SHA-256: 45a495fab4757acbbdf55808fa5ae1e2456d5947476c8dcf994ee63fd11c12ba
font_02_sfnt_off00012276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1