Malicious PDF — malware analysis report

Static analysis result for SHA-256 188d2583cc2332fe…

MALICIOUS

PDF

75.0 KB Created: 2021-09-08 09:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f5e0cda9474cb1581cb4686625924966 SHA-1: 0720f82d5e43331e9640adc7d3db0a3775e18d33 SHA-256: 188d2583cc2332fe7457c9107102437b27f0c38df6633f212038162473b9413b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://krisoc.ru/uplcv?utm_term=tp+chute+libre+compte+rendu+pdf PDF link annotation
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/fcef014f198f37ff044d6b0ac6257780/nudetuludimo.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/josurarewetamumokumapun.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/92616112495.pdfIn PDF document text
    • http://sonet.vn/uploads/images/files/vobivomakenuvekavipibada.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/31810811055.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/58640559297.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/sibumusuxemuvofubajatomor.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/31238935572.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b926b48b1---97980346171.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/lenujemikepodago.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/7945045351.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/7690941390.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/370200438abdd32b7b15a6552ea23a76/rudilogilafox.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160822488f12e2---sagagogazotet.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/69992251188.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ede96d23583---vapexinokezijalipe.pdfIn PDF document text
    • http://russia-ex.com/13246903351.pdfIn PDF document text
    • http://hak-al.com/resimler/files/19527016037.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f5a4c831---70401719403.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a012653c38b---75013358095.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///mawawukaj.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/pusukusolerebabati.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/895ed89c9106fd582545c673c33e99ac/8370889504.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/filebekurawa.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210812042309.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/nituvofakijulijolobe.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_off0000bf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 10760 bytes
SHA-256: 984f03d4b33d06d76d82866cd361566ca96ec36eea497ea9cb9f0fa8aac2fac7
font_02_sfnt_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 17844 bytes
SHA-256: 2c2bdbe9e83d4693d4e912e4915419bff338a9d84d75323de232ffc91e321719