Malicious PDF — malware analysis report

Static analysis result for SHA-256 b629a9b4742419f8…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 05:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: da40ca3b7821e007a6ce0088a57f16f8 SHA-1: 655dc87c88be57c5ea078c639f958c06ae0dc758 SHA-256: b629a9b4742419f8cb953e0d66b65682a4e6b8255dad41b8d7e5f9dcf7881b9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing sites or download further malware. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pchome.uzai.ca/upload/files/ronajofas.pdf In PDF document text
    • http://nuraski.pl/wsg/userfiles/wibewasegisor.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/dfaf1c8d961d04ab95e0ee84577718ca/71193372266.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/vefesijotiruloladobabera.pdfIn PDF document text
    • https://coil.hk/upload/files/bewigaz.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///sinorafokevufuj.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/rizudekunagojarogegagi.pdfIn PDF document text
    • http://speckrepej.com/upload/file/geworopuwigowodesusibawi.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/xadakigepazizovofarawe.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ac8cc2e6ffae658471be0fb0dd91f33a/75337291531.pdfIn PDF document text
    • http://huiking.cn/uploads/file/011231327355.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/18527984964.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614330e1c0ce4---7167875353.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16317553014771.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/62875669622.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/tupivesidivosemi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/visegatopufozutoze.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c0f1d8dc1---7129640344.pdfIn PDF document text
    • https://salonrewards.ca/images/file/10007366350.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613131a8eafe7---18558020702.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090300521573499.pdfIn PDF document text
    • http://sireny.net/share/files/96704235964.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/zatotujezav.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/gokubenuluranagufitemu.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132f60c2c205---dukanufuwikefodadibotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=a+aa+full+movie+in+tamil+dubbed+watch+onlinePDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/59707733582.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_off0000bfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB1 16472 bytes
SHA-256: d0ffcd6bc621521b129bb7e0c031993d5250752b114c09dc6865398fa6448b76
font_01_sfnt_off0000e9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 10844 bytes
SHA-256: 5eb9d6999dad4ad7a7de41940bdbc8cf05ba12cb3e1a2296a753009df846f77e

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