Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f3b6c47d31f5e2…

MALICIOUS

PDF

73.7 KB Created: 2021-09-13 22:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b2367415305fa34fbab60bd4e642b95a SHA-1: 69a79388fed4807b60807db48add9901c891fac3 SHA-256: 95f3b6c47d31f5e247584343fa8181c736486867c7fcfb7ce618f40279ddcd77
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of external URIs and the ML classification strongly suggest this PDF is used as a lure, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chcial.ru/uplcv?utm_term=the+ecg+made+easy+9th+edition+pdf PDF link annotation
    • http://ttworld.hu/uploads/content_files/files/bopokekegabemili.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/bujenuleni.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/35931364892.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fecdd2da0---53771787771.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/59113702513.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/nopagikaji.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/78497858301.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/16396260725.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/nipej.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/dq51rjfnmi83gagrbeo97nqiat/28131622608.pdfIn PDF document text
    • https://eslms.com/userfiles/file/36135236870.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/jeponodekeketidoxenu.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/garakusivada.pdfIn PDF document text
    • https://avela.md/userfiles/file/nolidodevabevajot.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/77543266676.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/12975230222.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/fiwomasutubabajepojevagun.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/sawoluxapalavifu.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad681461d7b3859e1008374fccf38066/kewuwopafalumejebaz.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/13034106121.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/59381130470.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/96724655654.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/gipuzamelovanafedol.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d84d20087---3382439277.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_off0000bd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD45 16180 bytes
SHA-256: 82ba02322cf68eb89e3bc0b38057ecb42642caaa4796ea57ed99c47c35343908
font_01_sfnt_off0000e709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 11164 bytes
SHA-256: 137a06079836a54fa664f51efcd99715882cc1843fcc504cfefe711c1761d232

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