Malicious PDF — malware analysis report

Static analysis result for SHA-256 26cebeceb6773fff…

MALICIOUS

PDF

75.1 KB Created: 2021-09-04 06:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82bca20c3348c3945dca9fe3389db040 SHA-1: 8c7d56e1d7b8f7e5551b9efbc787f40ad9060765 SHA-256: 26cebeceb6773fff8614cc17882f8646d93f66946211bc82fbf30c7de8ba50f1
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. It functions as a link farm, directing users to various compromised websites and disposable hosting, likely to download further malicious payloads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution scheme disguised as a file converter.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.thaiboat.net/image/upload/File/nozuxujagojezogotuduvo.pdf In PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/54537896641.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/futiso.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/26159449784.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6be6bbd8a---69926495083.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/85144024.pdfIn PDF document text
    • http://kasargod.net/uploads/file/wibevufajerurifilatunu.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/jopojivofavojuzituwipoje.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a352f5379c9aa84a92ae5488714fc5b4/givomajowalofitolus.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161106cd83099f---batinofelojezizub.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/1e98f50ed7c32fc8cb0b0ca3615ea2de/82786735076.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/98525403851.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/4qiugjdrgq8citg36l2eerg54s/zewumadan.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871ac2b5300---23515776431.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9efbb008ec197bfb7aad258667ae17f6/10550243713.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160adf5b0d08ca---4686482840.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/gobef919r846bvvmibkqdogii7/60104981445.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210830145231_1415339777.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/47392334251.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/176d18b703444fdd1a9a9bb606956a4d/85244362073.pdfIn PDF document text
    • https://drlanda.hu/user/file/lusarinuxiganarane.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/0vekhb276992ith7lnpgm6rtug/75968261271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=converter+pdf+to+word+kuyhaaPDF 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_off0000c2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BA 10780 bytes
SHA-256: efb9d6aba6d7aa6ecda18cd2670537bb04cdf3470e44266ba242fb17a7b96738
font_01_sfnt_off0000db9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9D 16892 bytes
SHA-256: 71234d94403e92f0b3e039f3792dbe872016b178ad3d1e39f92568866637dcbe
font_02_sfnt_off000106c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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