Malicious PDF — malware analysis report

Static analysis result for SHA-256 59788f2605df0fa8…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 15:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0489e06ba5fa7ba8f732ef5a274cc483 SHA-1: acc3a1aaa4f6374f508e053410dcc43f7b944d89 SHA-256: 59788f2605df0fa8ab3b3bd0efa05204d6a9f9229a67399ac8db365e38fb116f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The embedded URLs, such as http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/16787738023.pdf, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/16787738023.pdf In PDF document text
    • https://mabuksusu.com/contents/files/labesibunoziredokizej.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/vovatajerowomewejix.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/18063547149.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/200272c38d2b6850213bbdeb39628edd/dunepedexikoxop.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b9c11543e31263aa6a0aae56040c07ac/28188171602.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/89880845045.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/3779494119.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/74134152288.pdfIn PDF document text
    • http://eko-uklid.com/files/file/zubetuposeso.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/diperelimulidisa.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/20905c03df66a63baf86bccd8abc34eb/penomopibudobujerudadu.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408ed33c5a5---rogivofofematagawux.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/90435254188.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/fikojurak.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/fesopojesewimoketa.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161350c08e492a---vuzaroxusunevujixunibuf.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/julale.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/90543052932.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-9/20210909044421781664.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/zejikizidor.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/taxatog.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/vumudidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=unit+converter+ultimatePDF 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_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 18848 bytes
SHA-256: ba8c0e4cb1cc88dded2378a79fad67f1413a1c7eae80941cd045127cfd5cfd24
font_02_sfnt_off000121ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FF 10396 bytes
SHA-256: 6198989cc82824e6c3400cd66ef38cedf9e0dd51dda4db3a79788eb0b313d03d

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