Malicious PDF — malware analysis report

Static analysis result for SHA-256 607c5957409ad259…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 11:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c032ce7ab4f849f2d5774d96e86a4c7a SHA-1: 82988831e242eede0697a594ecb91ce0ee876eb1 SHA-256: 607c5957409ad259cd905197b0cd24df976eaa716e7caf11cfcbd538423f3f98
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised WordPress upload storage or disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://irlanc.ru/uplcv?utm_term=how+do+u+see+who+viewed+your+tiktok PDF link annotation
    • http://a2hgghk.handylover.com/upload/files/76203290667.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/16805544508.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/bugukaxusemexefi.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/xevegovanadivokuzatav.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/tireb.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/godopamojede.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ofq4tq8b6qcf24upvjs0bsla75/mibizitibufenuvedax.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/87047565632.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/bivekidewa.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/febufutigimewesudonik.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fowarum.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/3853681ece4dc4a13bf43aeaa1723035/47723169429.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/2827837208.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/keguzu.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/99855104420.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/41325002404.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/logikoxoseroz.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/21709824375.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa691d52a2---24337059387.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/fisoku.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/97810198122.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/wutumojepalifiluvuron.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210905215414319.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/durubitazi.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/rasepavap.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132e4aebbda3---55736463068.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/3121948717.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_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 10484 bytes
SHA-256: 94c1ec6a264e22222ffb4a06373e80b485ee76c00843c4dba77fb04d6c54dfa6
font_01_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 17800 bytes
SHA-256: fc1b74f61fd6d855df7a79f7071db5e53539dd6722590c3e4aec33a3e93dfc0c
font_02_sfnt_off00011fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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