Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb51e912e8ccec9a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 03:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5b743a127294ee94b40bbfb1279c0df0 SHA-1: 745113c9b1cba4a75dfa89560a50e1e29ec68e33 SHA-256: cb51e912e8ccec9adccf172ae5d3ee3691102918937216d4f7cf405a947a8f41
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests it's designed to lure users to malicious content.

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 http://eyela.kr/uploadfile/fckeditor/file/34230146555.pdf In PDF document text
    • http://an-professional.ru/img/files/file/71713413544.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/rodijawenezipejov.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/denufixuzutugopaxila.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dudonosizeki.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364a8a45b15---magirozuwemafisiw.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/718q43rg507fjqo88987omsgav/tigipimo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134436fdedc2---jofokitatironowemozubo.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/54261253644.pdfIn PDF document text
    • http://okvin.org/userfiles/file/14039318156.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/dapubojowa.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/bubitexewixalode.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/97234638257.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/toramawexij.pdfIn PDF document text
    • http://agavietnam.com/img/files/61354652362.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/ronaxuzisib.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/86730946801.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/mejotulajafeso.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/17942865182.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/gumadasabes.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/wopusijizak.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/90695036027.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad9bea861c---timubalakasidezav.pdfIn PDF document text
    • http://hkalc.com/userfiles/80503489548.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/genevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=download+wcc+apkPDF 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_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 18576 bytes
SHA-256: 6704bff379b9bd5ba9953a78a74ae01f4e102430d6e78d1d4901b3ec9467e832
font_01_sfnt_off00010f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F22 10096 bytes
SHA-256: ab8adcd549f45e5fb9c06d2301403c879ddbb6685fcf006421e39a59661d0bca
font_02_sfnt_off000125c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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