Malicious PDF — malware analysis report

Static analysis result for SHA-256 087b8243517fbfda…

MALICIOUS

PDF

88.8 KB Created: 2021-09-18 04:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3fa64376df76ae296e367f2dd8a3dedc SHA-1: 36b4d7b8b4ff9b0255b219911a8dbea772278f83 SHA-256: 087b8243517fbfdac6ecd31f67c7da72a14e5b363adfe86f25ad4566125ce9fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://zegaoyun.com/calisma2/files/uploads/55884418411.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/23716725782.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/32171478239.pdfIn PDF document text
    • http://freewest.at/36741177651.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/56305002033.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/18250437099.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/rurujafuvujusuvuvowus.pdfIn PDF document text
    • http://boldogelet.hu/media/74578619640.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/fesiwegek.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/vasowu.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/f0077b375c85c43f382718926bfea62c/95067602796.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/41943397966.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613077bfe35b6---52871779540.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/relixemutimuvitirome.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161369c70f3117---xawelagewopinate.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/46169650602.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614522a57c160---47920663692.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/toninojugafugelut.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/tefajifabelidufegejujeda.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/83046800981.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/tenonumavot.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021091715302091.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/55342405019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=download+biohazard+4+androidPDF 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_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 19072 bytes
SHA-256: fcce7a26171ae90e29053474e7d88ad3bb2768da08ee8f7b2e00cc83be144da0
font_01_sfnt_off0001263f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263F 10312 bytes
SHA-256: 4e67e95889fdc6b4c67c17a8a61281c144d6daa3e25cf48e989735d46e370125
font_02_sfnt_off00013d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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