Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c201a54f956f71…

MALICIOUS

PDF

86.1 KB Created: 2021-07-06 02:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 28ae2b3c5ef233ba6c75ca34549e5450 SHA-1: 86eecc63c3ab1deb2e64fb1cfc12ffbbe787e257 SHA-256: 78c201a54f956f71e27945469ebe6cf0c16dacf6808ecf738abd4094ba8c7f98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbcab4a348---33299774298.pdf In PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-31/20210531161316456930.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/28966183874.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/7ce61066b06276250ca55abb7de20621/13978807362.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/f28c22701d1c67bec9c8e33344d23138/55449233295.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/vituvew.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/3ffd32a619a3e5dbb00f07c0cbe7c6f2/wamotatowules.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/f418fd67fe6b7fb30bdd7158af4441f0/92987689727.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c6469239418---mitanudefanata.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/lodexuvuribawafalu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/12708085335.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/69747371898.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160829f035d7ff---jaxame.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/sinamameva.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609155e713460---velijuwogegalotufemejazo.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/gaxezatitedadilo.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942ee8d9e54---soburapigegofusimetuduje.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/35904255910.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/fg85mo3fnigrpddqnmhfkjhvi4/89511574604.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e17feb8b42---8922469270.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6c8ce4cc3---21099387310.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdb3d9e2a9---gejeninimuf.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9d2be1f02---xufedonagonupijeva.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/kukimemorumesezepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=definition+of+supplementary+angles+in+geometry+proofsPDF 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_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 16964 bytes
SHA-256: 7d4c06f65a5c3d3a1070105619f1738fbd1c4c6a990f355e1d14f9f60adfa387
font_01_sfnt_off00011785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11785 10916 bytes
SHA-256: 8bfea676773a2aabfab152742cdd6b65cf37c637a63b2e0f79762b2e5b6ec6fb
font_02_sfnt_off000130da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1