Malicious PDF — malware analysis report

Static analysis result for SHA-256 f616cbab0c77eb67…

MALICIOUS

PDF

89.6 KB Created: 2021-08-07 02:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: b48ae6661ddba4482d2a014e086c891c SHA-1: c4a10fb10ac09dd82cc4b05db49e8ca7b7ad6925 SHA-256: f616cbab0c77eb6725d52d383e4c5c155633fa16b62fcbb4810f26acf5f993c3
156 Risk Score

Malware Insights

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

This 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 websites hosted on compromised CMS uploads and disposable hosting. The presence of numerous links, including those with 'utm_term' parameters, suggests an attempt to drive traffic for malicious purposes, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae10fadd2ed---sunipowabube.pdf In PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a7a6122e---golufenup.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/piwumoteteritox.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/60335585005.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160995e863ce67---24926120892.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab0b493414---vakubumedulunoda.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd65b7d8b1---xesedoxudedagomejuja.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce59543e174---86303428052.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6c4c7b5d85db3272e50513daa1f64d0d/55220855962.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/9c642a9ebfeb1b65f797d88696b6f640/pidizefaratazeladenuwumiw.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088280a27f13---56146079566.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086da91b64ac---39459615889.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/35743544651.pdfIn PDF document text
    • http://airfa.it/userfiles/file/76529658586.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/bumototumojexopedenoge.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/9653236243.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/gorarugalefakexej.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/gapezujodojabixi.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/41660477371.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/dekagawupejozuso.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/fekikuvovawuz.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/funisupelizigesejor.pdfIn PDF document text
    • https://ms02bet.net/contents//files/pulowadekotebesuloro.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210703205859616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=minecraft+free+online+games+no+download+to+playPDF 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_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11122 17120 bytes
SHA-256: eaa0a7dd7ed2b6be0a9d83e68e8fe072736b920b33ce18a4c871504c93b625c2
font_02_sfnt_off00013df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF6 11156 bytes
SHA-256: d5697afa3304bc6937b6fc65675844f38fe9e138183739cb877f421ba0de3f37

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