Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfca5d7073521c0e…

MALICIOUS

PDF

87.2 KB Created: 2021-09-01 10:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 602e71fb6ebcc9e91d8f3e29836a349e SHA-1: 55c1d83177257f9a0e2a6175b0ea2255e3995f3b SHA-256: bfca5d7073521c0e73be9522148046d5046000a9ad81846d9cbbb51489703479
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cissud.eu/uploads/ck_editor/files/23108837552.pdf In PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608381e7e4d43---rimugagegupoko.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/65206646505.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/31944241869.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/movev.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/sedemibuxijobezosekilijik.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/92e29d0c7898bc174a23edb580b7a5ff/20906551435.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/68412368797.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/57106824533.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bf933d423e2---zojuwobawalumoxiromupo.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/lilemusenajimimasugosiv.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920a39020d4---kapimomutonakejegijujede.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/7c1260f36265f7298406b6cbb800823c/31473686054.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/60584620126.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/a50de0996e6be0f32953c42fe7064b6a/vukexuratefufase.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/r0b0rqs0tglmittbki6kcnlfh2/65743279210.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/1163c5aa7739060035756be9e29a5e03/36531262180.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/60366528681.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988bccf323a---27639218167.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/6b63c504c84ad88e6c502008c30fce87/fetegejepovifawukale.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/1470783346.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/laleraxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=types+of+transformation+in+ssisPDF 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_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 10548 bytes
SHA-256: dc9fd34c0e86f84b530989feb2a77ce367c0191f02ed65612d2f2a759e2089b5
font_01_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 17920 bytes
SHA-256: ffa764a8e98c834a72fd895cc6886d12ec8211c966c09bde5f5be3eccbf2dd26

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