Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea89c12a6a06f42…

MALICIOUS

PDF

70.5 KB Created: 2021-10-07 00:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f7d01ec82b528caa4fbb298179198bec SHA-1: 38698f58ecfd2f35a722741ae940573e8cb05930 SHA-256: cea89c12a6a06f4213fc34975de43a04f41f60e29bc8685401f7ffd127391e9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vietnamairlinescorp.org/js/ckfinder/userfiles/files/kadiwesuvigojipomunuvoden.pdf In PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/tosuju.pdfIn PDF document text
    • https://latework.cz/soubory/lixezuradipusode.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/95aafc2d2fffe76a0a3a510485fbbac6/31212084573.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/nezifeb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152c5e7d37bf---xokolubokodujejim.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/94120781087.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/82329025412.pdfIn PDF document text
    • http://emaaravm.net/upload/files/3033605598.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/dajosajojilevenizufiwed.pdfIn PDF document text
    • https://niceppl.com/images/file/66940500300.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/33014100373.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161591643ade38---xutov.pdfIn PDF document text
    • https://datenglagi.com/contents/files/32251461867.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366d6dec20c---tekexokonepidemarifuravof.pdfIn PDF document text
    • https://theipbuzz.com/images/file/20566638679.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/47926615099.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/75327285440.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/72988307750.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/witerowemeni.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021093023351541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=0.001+km+to+mmPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/ranuxotitapuruxisomowezen.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_off0000b1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D8 9700 bytes
SHA-256: 15658b41c7233acb5b74d0572435fc8c435c175e5faa3880a774eb1f6f105948
font_01_sfnt_off0000c6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F8 18012 bytes
SHA-256: 94a51329a7fa3ec49ac398dea70c78b9f51e05f7fea4a69ff0dbbf7c875e31f2
font_02_sfnt_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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