Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dad8cf18007c996…

MALICIOUS

PDF

89.6 KB Created: 2021-07-19 05:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a5a0f86ebbcc28849b3ccda062967d92 SHA-1: 37ad23f62dc1eb96d9eadc53c8d25641ef00d0c0 SHA-256: 6dad8cf18007c996b400c22235f4035252bc9acbc8e07c10a6ce0ea45495450e
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 ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution vehicle. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious sites. The primary attack pattern involves luring users to these external resources, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://egyseg.eu/ckfinder/userfiles/files/87609599624.pdf In PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da331b0600---berepisojorurad.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607564292c429---77096021104.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/pejavalefituparo.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/mifukixegapamolo.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/gimikozixukuvibuvelirita.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/vanarepi.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c29d23c56b---palubu.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/59155824994.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979aee10799---83529403132.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/bobosagudirozosifugid.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/82604007157.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/6c6idm84a4l84ha73r442bpif2/farikosonafo.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/zazaroroviterijomo.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/20d73146d9b438aee6b6f9b319830633/17793918572.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d70b386cc5---67507674879.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021060907111273499.pdfIn PDF document text
    • https://puntoagricoltura.it/file/37087633919.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/50e2b2801dacc1a22a8636f1a06c92c3/17740150951.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c648eb5ceae---jotejekudivopesepode.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b74717dc6b8---87022211965.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e01ffe8fdb2---waronokomikulekegiva.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083e6b21473b---9909502997.pdfIn PDF document text
    • https://sy-tech.eu/file/4851292729.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/zazikojijakewonusidexabos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=synthesis+paragraph+outlinePDF link annotation
    • 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_off0000fc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 16876 bytes
SHA-256: 58ad299c492d749dd9e9f82ed78e52ed8222cec2cd1e4fa540a49d1f1ef47c94
font_01_sfnt_off00012812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12812 10820 bytes
SHA-256: 31bc55340af89e95501f16658a2e6d06df18b33d2b9afbb5c0c241c0882b5d8e
font_02_sfnt_off000140fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1