Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a18fbb84fc924fb…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 21:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fd095168a5ccfe21ffba9ebd5b4008e8 SHA-1: 5ae75714de09310d3403b4a8d57b2464200ece85 SHA-256: 9a18fbb84fc924fbe5be544bd1e1223a3cacd2584affcb9f90aa3b31c065205c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially disposable hosting, suggesting an attempt to redirect users to phishing or malware-hosting sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used as a lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=group+and+ungroup+rows+in+protected+worksheet PDF link annotation
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/h2hrbc1mvr12g9on2dn4fulf36/14220443115.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/97090535930.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c93cbf074---31473539630.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/dososawobutewupupebamisum.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/25251607904.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/f833917a8124b6705e46df3bf2ed313d/21027770852.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/zoxuvisapajed.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/semexudoxinogopanog.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/fefogoruwifideluliwad.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/200620564.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/dotabiniguf.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/63763289970.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114297e6cd90---89428550706.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16079430de1450---sutadiduwurogorez.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4338801bd2---xegowosesewozajaz.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/34563864082.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/87711593355.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/xilakulav.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/eo95rau34qjp3kjoqpd55bmvaq/rizem.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/92ee2b722e84dbad9af216e2aac8451e/58596351039.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16274370833467.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/pezoso.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/bfabb958e395e016b83778d481750bdb/71506217783.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_off0000d32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32A 17912 bytes
SHA-256: af6a6abeb09903ac27d3ce97be87c0fe2eab9023a73ee0988b185df6274ac0ca
font_01_sfnt_off0001020d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A24 11064 bytes
SHA-256: 0a4eb10673f1b7517a60656f294953ebc800300516d5ab92c1c5ecf1c96f9f16

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