Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff15b1881bf4d0a9…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 01:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f56ef704d756bd1f1077a34bd7fc461 SHA-1: 63951074e7a0e015d8f6fb4f10335adc1794ef95 SHA-256: ff15b1881bf4d0a922c94fe47f46e8771e6cb02a98165ac3279c3357051cdfd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://garglob.ru/uplcv?utm_term=if+you+reset+your+android+what+happens PDF link annotation
    • http://icaalliance.org/filespath/files/20210918133358.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/xelugajiwuwiraxira.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/88354899815.pdfIn PDF document text
    • https://soechi.net/userfiles/file/kulepixuzutataki.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/41567010287.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/275195545.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/wasutimodekezedotani.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/40171502953.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/debobar.pdfIn PDF document text
    • http://gojjang.com/uploads/files/lewopaxegenokula.pdfIn PDF document text
    • http://viorina-deko.com/images/file/pojagatudojopiwomi.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/12767325645.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/gopinaxov.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/6e8c7a7273983fb891c3b2cc112a2658/kuravurikoraxorog.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/39652965393.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/p4f1v3cgn4ht48uviunopefpp5/17118871405.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/sinisifopolut.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/92168419767.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/88130134562.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210912124509.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-5/20210905002512780264.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/0cgujgamhgsk3krl9ep1rsfn71/51605272204.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/49448254995.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/jebisisapimo.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_off0000d5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 18192 bytes
SHA-256: c3a777840f7cedb2fa0773167647f9d2e519109f1ec053265b345d43998cd5e8
font_01_sfnt_off00010534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 10800 bytes
SHA-256: b35bff7568636c6faa016d02f35d07f01accd3cb8e306a918310d4e78e30cbf9