Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e81f52dfc1ad6aa…

MALICIOUS

PDF

71.3 KB Created: 2021-09-19 10:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8323d07f898d85912ec4abd668572b95 SHA-1: 4d1ee20edfba91d395fd66ba8ca8cca6b059286a SHA-256: 8e81f52dfc1ad6aa390b1897479c83d9015dd1d04e6864de6bd7c93cff068f50
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests the PDF itself is designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://majubesar.org/contents/files/jibilarumojarofodesuxa.pdf In PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614143f7068e2---46317735413.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140188367ead---17622472097.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/19975153974.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/mupafukulewewufitaga.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/vobanapikima.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/19968563997.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210902_071345.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/844dbeef8182d31969997f10b30fa90c/ragejuxik.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/91430735737.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/5225037313.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/gomozupipebepozugabosi.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/39320377983.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/xorikuvimavedifuni.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/23807491068.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wibaruwi.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/72822206287.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/94648504040.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/nisokozofejugavimaziluva.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/19486027288.pdfIn PDF document text
    • https://terracell.pt/images/file/fapoto.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/ratudateresefuwidisezige.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///12176680262.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/nutimifusomuvatusibume.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/vawin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=kimetsu+no+yaiba+season+1+full+episodesPDF 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_off0000b3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DE 10956 bytes
SHA-256: dd7d9a1ae72823af4daaced2c421248cee0a2da7764bafcc7009ffe07f6e4298
font_01_sfnt_off0000cd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD24 16480 bytes
SHA-256: 52315083936f3cba2850e99b5effcae7b2c4a8e024d475a7078a3ead3fa14009
font_02_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1