Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c921d1acff95aa…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 17:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a214f90e9be65e5b8e80996c978958e6 SHA-1: 6107426fbdbd9651f7be8f121fe81d0616da07fb SHA-256: e5c921d1acff95aa1d5c354be4722239b9aecf5391e1af3a789ab83bd5e10c40
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://burragebrothers.net/demo/jolie/beta/userfiles/files/xenetubadovemesibe.pdf In PDF document text
    • http://pampa.be/uploads/userfiles/files/jirowitedudikifipaji.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/13283880517.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/sezivesamobovetidaka.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/gogidavupoxoju.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/23624947209.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210529_100303.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cec99699290---webanonunasegim.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/tuxuverarodejatizureja.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/94762444776.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qmk5vnvein2ai6uart6utqf91/tonojupateraxunuxogo.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/l1g95hr4erkfok0ttgak5fvsga/gisixaruvigigubesumura.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/14224217097.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/512cc457b78f3474b58d4cbff1e0e68b/52670808613.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/kirebonidupivelunatu.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e1a65d30c---xalakiwegawimi.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160acc8c6c6c68---36014473009.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/43269832195.pdfIn PDF document text
    • http://sabaparsian.com/ckeditor/files/files/11268884303.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb7f3798c0---dojusizigupefimuduz.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/55169621704.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/51476271704.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083260441390---demeturim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=womanhood+books+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/516c9c9c82718118ea89589912b8077f/69742297095.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_off0000d9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 18672 bytes
SHA-256: fe8c6af069a907c1b1e2d26d60f699ac6d55af2d929f5ae4a3cda7180fe5d769
font_01_sfnt_off000108dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DD 10520 bytes
SHA-256: 66536831b2f9c7059d2dbfcab0b021ca4fa185b849c699567ccf02d84a6fde80
font_02_sfnt_off0001205b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1