Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8be191a3951630…

MALICIOUS

PDF

83.9 KB Created: 2021-08-21 18:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 523bb7ed24ed8ab209f9b2c9f1b6482f SHA-1: 58ae38a5d53f2e8bc48b4146989eac371403213f SHA-256: 3d8be191a39516309646068a166a5fdadb19a40be4ad3e2208c46cfb7220c6ce
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress installations, suggesting it's designed to redirect users to malicious sites. The presence of a link farm on disposable hosting further supports its role in a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=teoria+de+liderazgo+situacional+ventajas+y+desventajas PDF link annotation
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac457e96de4---93819942989.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/12562183360.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/dbe6c843b6fe36ffee5f104a489f6b94/18566587251.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088321440d3d---52900694554.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba78e377e3---xurukogugedi.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ir6g9jds662jmnc2h44buqcpgs/78916896200.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///50429431883.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c010f59574556c91ca3a9a07879809bf/gatokupe.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d79f4c781b1---42558014178.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/84621640542.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/koxejezedimogivofalobovak.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e645d1a78c---33494798630.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/vosusuwokobutolime.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/194ff76ab1f412a195bc29772eb70f0e/fumosemowejivake.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee2fb198dd---jizugevevuto.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d94e48286---9862340712.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/labefidufozapusixusu.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/72343625063.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e34502944b---15803991550.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/6299128153.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161182b9a694dc---77506559137.pdfIn PDF document text
    • http://dzbnf.com/upload/file///75036612205.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/41818803013.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160841f4a7d550---foloju.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_off0000e265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 17280 bytes
SHA-256: a642cecefd4a72377e2c4162fa147188bb7dc8541f337905c4e198bd6ea2961e
font_02_sfnt_off0001262f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262F 10980 bytes
SHA-256: dfffefacb5e4f7869399b4055dbc2ef466fb0d6351b24401233412038db8657f