Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b70e88cfedf7df…

MALICIOUS

PDF

75.7 KB Created: 2021-09-23 01:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cf62d39c9a8fad07cd871ab8bfb3b105 SHA-1: 060e9c3775da8c501c0636f0ee166507145707b7 SHA-256: e8b70e88cfedf7dfb342e88c5e505dbb790a095e011c9b3e3d3b7cb5cd67ebbc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to act as a link farm, likely to direct users to malicious content or phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://alocainghien.com/uploads/userfiles/file/14607519748.pdf In PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161361171bd70e---81049722489.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/80830962200.pdfIn PDF document text
    • http://ave-france.com/pics/files/80808320018.pdfIn PDF document text
    • http://netflor.pl/upload/File/roxawubove.pdfIn PDF document text
    • http://partnercable.com/files/vedubetasorijewidomope.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/24481514456.pdfIn PDF document text
    • http://sinoorchids.com/image/file/vitel.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/23057255390.pdfIn PDF document text
    • http://bwc.lt/i/57925796439.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/kidejabopugujiro.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/ralopifasegutizuderosup.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/78041040835.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/dumatopumowepekabigaxuvij.pdfIn PDF document text
    • http://prompol.com/media/file/55099852460.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/2f7bee47437394111a2f8ab0b6923929/60048462019.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/vuvemi.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/2523255577.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/37582482050.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145b244459fc---76631798566.pdfIn PDF document text
    • http://honghuibio.com/d/files/35834963515.pdfIn PDF document text
    • http://origo.ws/userfiles/file/kukupuzodijeza.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/basakimubemeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+game+coin+master+mod+apkPDF 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_off0000ba23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23A 11036 bytes
SHA-256: 474698c25ef2c5bc685bc4dce61d725a53704e40f8768e55c14eac40c890c31c
font_02_sfnt_off0000ebb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 20460 bytes
SHA-256: fd136d93a4ba6c823fbd664b74df1b84e2fcd445d497730fa38c1742130adb2e