Malicious PDF — malware analysis report

Static analysis result for SHA-256 2988dca57eaa39d9…

MALICIOUS

PDF

68.1 KB Created: 2021-09-02 00:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c6f36e68759e1198ccfe421c2d964ae3 SHA-1: baba929961e18f5b80b6fe0f018e65ed4bc225f9 SHA-256: 2988dca57eaa39d90388bcbbf962af33cfee6b35b6bcda456e8de65d18cd069e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, likely intended to host and distribute a secondary payload. The embedded URLs suggest a phishing or malware distribution attempt, masquerading as a download link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=download+neon+shadow PDF link annotation
    • http://greenworx.eu/images/uploads/files/75234315469.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092b1470b01f---72387819924.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/roroxewilo.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d14ae80a9a---33564233255.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/e4a37ddoj0v71fj3rc2lard5a8/xatolalu.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/16066410550.pdfIn PDF document text
    • http://roocenter.ru/upload/file/40259268104.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/dewidukagib.pdfIn PDF document text
    • http://gyobel.it/public/file/28531969262.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/c0d85c3bf8f70c56c9d8e1c3035a4e59/xizifutibe.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855946db636---61846330871.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/i3laaesck4cc1i6sbg8umaeir5/72215412464.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/26625737372.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/af7316c507ea4d2d419674761a232b07/wobelurijanapigidefuki.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af66c740118---5218342825.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/lovipomux.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/xajetikusamalefovi.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607119ddb639e---65855097863.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/25601903385.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/vodanosi.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/fuvanulenunod.pdfIn PDF document text
    • http://st03.it/userfiles/files/gozovuzepepizadotijapo.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/85716459669.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099602f19e48---mebosifigazexasitamugalap.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_off0000b141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC953 14404 bytes
SHA-256: 616e4496d9d985636148d03a10a08bed576215e2d74d0f20989ee0a166a4ad9d
font_02_sfnt_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 10144 bytes
SHA-256: 2f2abb9eb223e7c22995c215d53955018b792756ebdb09c28f98714ef03c011c

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