Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1050b03da7fe2a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 05:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d25acf2da189507cd656bf5edcda7d4a SHA-1: 8890f79d0424c509f314826b60d09446d72553e3 SHA-256: 9a1050b03da7fe2a6e3671bab7842048f80077132257b0692b990a7c76487361
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=halloween+party+agatha+christie+pdf+free+download PDF link annotation
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5b16689de---jupenerobufokisiwobogijen.pdfIn PDF document text
    • http://hbaoge.com/upload/files/jofituk.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/21926620900.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/lirunumeketixaromoji.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/rafazuwijenotufede.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/jibotolufufarevuw.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/96956513218.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/17033923686145e02c79b2b.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/pegulefi.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/59245549039.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/sibajix.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/pusuguxafi.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/dovax.pdfIn PDF document text
    • http://sns.hu/_user/file/18637961879.pdfIn PDF document text
    • http://farmina.ru/uploads/files/79333755919.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/89298fbbe1e5fa1743283a2c6a884734/73552854078.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/80318389085.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/29580139816.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/nebewamedapixuguranejef.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210918_161623.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/77808305669.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac483092a---vobogunovogabujisapu.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/18018119438.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_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 11092 bytes
SHA-256: 0a7fb77f335820344886b3e001077b0aa36fb45d22730ee434626f77d7919e63
font_01_sfnt_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 17768 bytes
SHA-256: 9751c62b0d9407b46380945cb9160f8e0686f140e7ea4004d9c1c347b43f1d2b
font_02_sfnt_off00012bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1