Malicious PDF — malware analysis report

Static analysis result for SHA-256 0863497928d3615b…

MALICIOUS

PDF

86.7 KB Created: 2021-07-08 16:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ea836a96418a6e357b65d7ad84a4e664 SHA-1: d92f32a9abce374c9baf1ceede6ac5a88a5be3cb SHA-256: 0863497928d3615bf0c27d36e8ec0a1d274b594be73f3773e73139c7913652bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, including a WordPress upload directory. The presence of external URIs and link farm characteristics suggests the primary goal is to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://queure.ru/uplcv?utm_term=stiffness+at+the+back+of+the+neck PDF link annotation
    • http://www.heksan.com.pl/file/gawagen.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/54024078003.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/301771181.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b07a57c0fac---pumijomeruvu.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/47582189463.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160aae24351622---62441347098.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1elt2njac1f18mp0t3cg0njpo6/vapikagasofulebamufa.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/0fce29cf79289802a97ab6836f6bb804/58901909727.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/kuep8ntujrjjha7b8ha089m1ih/toxufewaxisevegu.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/a84a6ac2a50b2b7807ce9ce452a2f37d/41650438157.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc7de45ed4---95072452588.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/noputone.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/833e09eb7d45e35c9e218f95d1fee192/xupete.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/bolavebumu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6cbc458d791d3931682263c1d004e027/98993516720.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/07c891874bfaccc885b3c413164204fa/mimoveb.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1711eea29f921bfa95d4b83232de12a2/zapevodorirugiraseluvota.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/17150479027.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/falemesufapuraduxudom.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/49774178831.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a1a6ed0b3---rosoxadu.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e27ce758b---nureseveziwivozagebituba.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/26b6ddb914abe66e8f0209741252f7d1/bojepukugoxasetizedeb.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_off0000eca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 19228 bytes
SHA-256: 912c98a5daf3e6791d79531b92bab38e7fa0b735d920c8586d4fa85b520efef3
font_01_sfnt_off00011d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D87 10592 bytes
SHA-256: 8c608c56818bc723bce27d68ccf0dd84b37321d5c002c031773fc2be2f02686e
font_02_sfnt_off000135ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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