Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0080e55b9fa2637…

MALICIOUS

PDF

70.4 KB Created: 2021-09-04 09:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9abc0d4b038a67dad9c9a26beee118ba SHA-1: 01b29f67eaca06c974cd7d862996b173279133d8 SHA-256: f0080e55b9fa26375f632bc2715111c65aab2a294ee083601842c39d00059502
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a mix of compromised CMS uploads and disposable hosting domains, characteristic of a link farm used for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external links suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://iberia-ex.com/images/blog//file/majekudaporulu.pdf In PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/74436003819.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/mitemalemudakavosovulige.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/rurosuboresiwezipupi.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/e46018fbeaq3vh0uo522h47uq0/44202125546.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ee320a0fbee89b0f2bb81867a72bbd64/20148306814.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a026b7ca81f---muwunupixoz.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3fd7bff9a---94266872624.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4e8c9c9ed---jejejitetaf.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/ketitetezanikonironit.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/70389524116.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160829daa36281---lujimep.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/bukosewufonedenoto.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612e265545508---19185357958.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/zevuv.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/38022279159.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/46f13cd3749dcb7f5ed770eb053e6d94/digugozonam.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a7a78f008---tapodujefojexolakej.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/famemidugofebifewidu.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/gupekowisezenafozikeloguw.pdfIn PDF document text
    • http://ecole.ru/text/images/file/80073583065.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/23989741238.pdfIn PDF document text
    • http://unseretochter.com/images/file/14401187464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=10000+verbs+in+english+pdfPDF 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_off0000b693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA5 14940 bytes
SHA-256: f4b706f880faac14a5edf3e19953628fd014a7f1aa0280f936b2e3ad2c0397bb
font_02_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 10680 bytes
SHA-256: a35ad0b726a3eda2b3f12242bf5a2b0eccd6bab119acbf15078efead729540f4

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