Malicious PDF — malware analysis report

Static analysis result for SHA-256 271ac3e1b8261933…

MALICIOUS

PDF

78.7 KB Created: 2021-08-09 18:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 33841b3e94285e3adaa89bd67d802394 SHA-1: 962b193cf21dfca837994f4831ccec70869283f1 SHA-256: 271ac3e1b826193395b8b0c6a6dd04f3c8740eb86bdca75452dccb28eefa8315
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised websites, likely intended to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/161028ae658017---2171396136.pdf In PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/jibubojavedu.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/deloviwexewifade.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/82d213197bd07668389872a4b429bd9e/walijulededafabilusunexi.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/bifonafawudalobaf.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/15053542948.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87778783336.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/47466893486.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210809214405.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf095dd036---108021063.pdfIn PDF document text
    • https://topaldanang.com/uploads/image/files/rodofusitopewov.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/kanogubafod.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/pexedovofelumaxur.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/39713770288.pdfIn PDF document text
    • http://jarosi.hu/files/file/24473153529.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/wizijokuwijumesinujixuse.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c33dbb547---71111339713.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccceb7615f---67627107865.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/48382566fd91f3f2ef59df5dab9a5118/gapezane.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/5cc58f8c04f3283995963568c5eb6218/digifidodesijaxibo.pdfIn PDF document text
    • https://anaksemut.com/contents//files/lufosekamikuxare.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073e08cb8d75---jogitiletigugonasim.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089054e83a7e---makaxek.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e7d276590---nesaluwajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tamilrockers+2018+sarkar+telugu+movie+downloadPDF 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_off0000cac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC4 11524 bytes
SHA-256: 92139690febafbddae4933445f771a831082b88c7c20ad4171d856c1d443d3b8
font_01_sfnt_off0000e604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE16 17384 bytes
SHA-256: 7dfd004cf46947ef18eae4e58826aace7efc511313938c1903fd40e497ef36fc

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