Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a2d25c6b62c0ae…

MALICIOUS

PDF

85.5 KB Created: 2021-09-03 19:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 901cb5229eb2a0f409212df498f8cee3 SHA-1: a8d241563d6cb8522c1adf3698cd853fc3470cde SHA-256: 27a2d25c6b62c0ae3db36f4471bd4aee265def0833b4d7101ca91c59f4eb0d9e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of 'wkhtmltopdf' in the metadata and the heuristic 'SE_LOLBIN_RUN_COMMAND' suggest the document may be designed to exploit PDF rendering or embed commands that lead to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://smidgel.ru/uplcv?utm_term=rosetta+stone+english+workbook+level+2+pdf PDF link annotation
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/81109026455.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/128245021560c78a2b13b5c.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/ralizaroluve.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/50763009645.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/eedfisdce7jeecsrg8icroqu86/31576336143.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/kakebuludaronogaviwufup.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/b4ed066bb0b58cf2ba2e3283296a0de0/80665158419.pdfIn PDF document text
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/ruduf.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/kurubedonakadokijatuve.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/gezagizidujimiriz.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/vtviesqsqcdr3dl3jd10cf51o8/83920507797.pdfIn macro / runtime command snippet
    • https://erdemlerkoleji.com/resimler/files/nezet.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072016c81cf9---82823260594.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/79079925666.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1a2ff125e0e7709218bd79f8783c232/64453554926.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f697835390---84950917491.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/2521227807.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f575fba26d5c6459e0fb29ceac381a10/39039415374.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/datuzi.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/36901543712.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/raxiw.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/22498516221.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/nupimokebulisetudir.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d67f33a780ecebd8943eb60ad52681b9/dulamolituxozovelinenod.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_off0000e51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51D 18536 bytes
SHA-256: 4548daf2a317a98a83cda4e408b2772362738636ed394f9f896fd97337729613
font_01_sfnt_off00011570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D87 11328 bytes
SHA-256: f4b840a2c44f5aa2b1da5c6ddb71790b866e60d3f1666850a5aa357ca6d5c7aa

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