Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14688ce18a603ee…

MALICIOUS

PDF

91.6 KB Created: 2021-07-26 11:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9f9cc5642e4a38fd344eb72a20233831 SHA-1: 3f9d568bc1b4bcffbbefa0717a9588d6805e0909 SHA-256: c14688ce18a603ee89c0adb59e598e1e46b601f53900bec3f6828499c46d89d8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm, likely intended to manipulate search engine rankings or redirect users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the phishing/trojan classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/81b8ef830b193e084fb4d383d54eb3ba/pupava.pdf In PDF document text
    • http://dansensvenner.dk/imagesfile///tojujefomirogerimi.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/27a46438715388a1e6f318ccc079c814/gimekasotojosexo.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/477668ef94d92a56765ba284d7a6bf10/34777421125.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/febomizagivukokipadogam.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/43835538630.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/t57sls26oruoqlgt7upai76vmv/xokinovilinozeligosanipub.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e824c2a217---68417007756.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/77e09d9a00ac2c3c22c892de200a8166/84216063355.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/10626429067.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c854791b4e2---kataki.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/8ac4735ebb7cf748f308dd2e253a6af9/revejog.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/23210611459.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/bixinonofabigezawemobavob.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2766e60f---belez.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e91701bae---fomuporineselafajos.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/8m3rcuarn0pod20ccvumjei46p/sakadab.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/28690841546.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b7d776f4de7e87a56452cfd7416699e3/rotogujararibitar.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc17436151---49111844475.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/zunemifemafitopev.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/23f7cc1a220fe0b55fe0868986085e13/69053070524.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94aa267109---vawozebiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fitness+gear+pro+ob+600+olympic+weight+bench+assemblyPDF 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_off0000fe66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE66 17544 bytes
SHA-256: 63f9e2d3f06facaf91978bd60f4d6a408feb3e8d44299dea4a895a076e6baa15
font_01_sfnt_off00012c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 11428 bytes
SHA-256: 1c73ff00864d1818a84429398ed0430bc29e1cad4e61a2157dc79a7f5d4419b6
font_02_sfnt_off000146df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1