Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1efb290aae88c73…

MALICIOUS

PDF

85.8 KB Created: 2021-07-27 06:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78f1e5c567a01868e6e20a6cf63998c1 SHA-1: 9d27578275a1a3ba1428ebe68a0c4bb8036c43d4 SHA-256: b1efb290aae88c73f80d364f1eedd75f46f6d0e97d3b5cbae82be1d31554c9a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as a link farm and by ClamAV as a phishing trojan. It contains numerous URLs pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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 http://tuning-zone.eu/userfiles/file/60595730864.pdf In PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/dufetebexidijadego.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/48bb691ef64e6cb4c18dc98c12d52dc7/fugijobawupiwofilesutevu.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/91314545535.pdfIn PDF document text
    • https://sabunwangi.com/contents//files/gaxezewivoxedelasabitu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607641d8950ec---rogajufusuraxop.pdfIn PDF document text
    • https://aspirans.com/files/file/logavitofeg.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16078ea83b9362---48610427835.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/lefagiwiwolaruno.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/sizefizubu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7c7854e46---nikubexipagufol.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/mafojiwuvusiz.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a548b1b75e7a87819712885311da4e4e/52727742289.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3cg7j2e4kj5o0e3uu3f49kmv60/19518938237.pdfIn PDF document text
    • http://aplus.to/userfiles/file/18680935618.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b44a50773---8939474294.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/74522746457.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3dfb680e0---gepuwiwerazerurevolunemeb.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160713c36b8a0d---gerofuto.pdfIn PDF document text
    • http://www.kammerpop.de/files/file/1492844904.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/45151390033.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/26312764826.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608832545f353---56179158331.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/savivi.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/sufenobazofetotuverediw.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/86040304491.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/79038505542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=%D1%8D%D1%80%D0%B8%D0%BA+%D0%B1%D0%B5%D1%80%D0%BD+%D0%B8%D0%B3%D1%80%D1%8B+%D0%B2+%D0%BA%D0%BE%D1%82%D0%BE%D1%80%D1%8B%D0%B5+%D0%B8%D0%B3%D1%80%D0%B0%D1%8E%D1%82+%D0%BB%D1%8E%D0%B4%D0%B8+%D1%81%D0%BB%D1%83%D1%88%D0%B0%D1%82%D1%8C+%D0%BE%D0%BD%D0%BB%D0%B0%D0%B9%D0%BD+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BEPDF 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_off0000e071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 11556 bytes
SHA-256: f5d3b0e40f52ec2c35f25f35ba343b19dfc41040aeaab90fcb966bfcd1f5b0a1
font_02_sfnt_off00011325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 21340 bytes
SHA-256: 848efc4b6e280f59de82dcebb15aeb397dcb69781c8fdffdbaf5869d70db05cc

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