Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a3bafaab9c93a4…

MALICIOUS

PDF

84.7 KB Created: 2021-07-02 15:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 10e6edcadb34f34d821adbd1311909ee SHA-1: fae785da03abe8489c82df6ea35332c336edf8cf SHA-256: a7a3bafaab9c93a4045d69eaa92eee84a315ca85d97e76e59bc96418bd219594
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves directing users to external URLs via a link farm, leveraging compromised infrastructure to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://inwebjor.ru/uplcv?utm_term=track+matte+after+effects+not+showing PDF link annotation
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/9a76b30ecea92d9bc61ccd34bc373a0c/sededa.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/wonunurugikepatuvirapak.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d199103c95dd6c208b6da2722774ef42/29573684907.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9754b29a5a---9970619751.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/natikokipumed.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/kawulam.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/6986968279.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/2ehjh8cdq813va6s2r36lm2qvd/gixuzoretave.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4d4da46f47b7399976bdafcb7c8230df/jorede.pdfIn PDF document text
    • http://airsoft1.ro/files/file/9671874368.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/90277329992.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb6a74d36e---96140733440.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/malejuraxuvolitezotuveser.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/u6va5pvgps5qojdpk3rnm49fk2/47595608001.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/87467991708.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/71167055161.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c778bcd07c---81033093844.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/eju84n0j022s5f75erp90oqbqm/30037464038.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160801c4a40f3b---26399910141.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/botigi.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608543927f5ef---46848944672.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_off0000e627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 10880 bytes
SHA-256: ee1cf6c78e156a91fc8b8bcd44804eb1914e6e68b85e73809cde9e7318d2b2c3
font_01_sfnt_off0000ff44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11756 17188 bytes
SHA-256: 62a971abf5d3bcd2fe7129f8525468f7ad67c4bb7fe2f973ea721655f636ee98