Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3529a33e4b1d63…

MALICIOUS

PDF

70.3 KB Created: 2021-10-01 10:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 72a056f07197275a6b48d17a99caa55d SHA-1: dd38c8f3b0fee52a5ae3aa02f3eea53425566ee9 SHA-256: cd3529a33e4b1d6303e63e04501d9ad0bac802c1b864141935aa4ad4494c9ca2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://queure.ru/uplcv?utm_term=how+to+connect+keyboard+to+android+phone+without+otg+and+bluetooth PDF link annotation
    • https://xn--fct8ml6mwue.tw/uploads/files/79686724335.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/wojivakexajivenoguv.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/modibozorawumogonixal.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/94542006690.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/patijerunukaxaravex.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/mevotu.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021092201353173.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/63359899917.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/85651220044.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/39503363941.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/dawisutewoninogivil.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/10800594186.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/86256090849.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abbcf9357e---55475933819.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/735908315c704591db9449cc5e6031cf/wililiwi.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/79821632660.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/40794539103.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/59531496714.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/98784862012.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/3003929505.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/70926761580.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/kumupitewo.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/foxejapixawakaxokinixofu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614145905dcc2---ladiruwajezako.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_off0000afd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EB 15492 bytes
SHA-256: 2ab91129d711ac178fe418dad04a41d2f0ca5dcd734029ca25b4d78688854797
font_02_sfnt_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 11148 bytes
SHA-256: 452f408479e1a59c97f94d2eb552273a7dd70fd605cb32a1e7943b7bb0f9bd93

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