Malicious PDF — malware analysis report

Static analysis result for SHA-256 cafa473e9cd18aa8…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 07:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b402919c78df117c942b71a733682f50 SHA-1: 3880acc198002d392e7af7c93e05e1363e056a3b SHA-256: cafa473e9cd18aa85cbc0b3754f244bf7d4cdd2b5fc5d9a7360e1f1d3e774ac2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://tavio.ru/files/file/tazawogedoj.pdf In PDF document text
    • http://biancoacolori.it/userfiles/files/69850938500.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/37342960390.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/29815163658.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d33c0d004---48825909792.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/rcun8iamr8sobdqd7ub9bpk3kb/47908256321.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e634fae6da0---fezakuwazisuf.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/dalamuzobenela.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4c303483d3dd1bc3c6e80a62c121cd3e/mimilefogewizax.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611985d59c357---detevafum.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/b483318416662e281780fa45a3d39b15/badogasininifi.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/77319457950.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/sivefopomivexeso.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/vesagiwunezekuku.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecd42f0e7a---votebu.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/dexupimenexapoxereto.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/73233077797.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3c2a1a239---96147198146.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/0b20625803554bf9a38c57f16be45bab/gokaroxuxujuz.pdfIn PDF document text
    • http://cokhisah.com/webroot/img/files/66988210052.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d96affd63fb---86421855233.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/3831533803.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/gawuwejowok.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/88042239470.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/fotudaxigikuto.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160803f7836d9b---35911013311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=operation+and+maintenance+manual+examplePDF 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_off0000d4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A2 16908 bytes
SHA-256: 624953c905ddb04aebb2ce05ffbe63dddf533fc88f197c2f1cfd2c1e1fc14a5c
font_01_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 10732 bytes
SHA-256: f9671255bdaded55e8faba0dec1af6d92c3a408a7cc1d7b99ea6c4421464e09a
font_02_sfnt_off00011874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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