Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9090452a9acf4b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 14:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a53e0da9a17dde6ab5d6bd97e961f7d1 SHA-1: 88b3f14ef000956dec86f17bf32c02fe07394d73 SHA-256: ec9090452a9acf4b464c648c823f100f576f5462ea5212a477de86fd034536a2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a PDF link farm. Multiple external URIs are present, some hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of embedded URLs and the 'link farm' heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://chcial.ru/uplcv?utm_term=best+free+robux PDF link annotation
    • http://china-miyaco.com/img/file/20219602832.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/zarabitajaxukolavibuvis.pdfIn PDF document text
    • https://ivanamihic.com/files/17467446694.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/63596007881.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee6fe612b3---10503188569.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/tejowukariwumamonava.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/binazutaworote.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/zojumipogeliveveneru.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/23439710137.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/47834785951.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/gakutokegajigi.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/leduwasuborub.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/83303408863.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/28000229514.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/zemibenalowufuja.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/foxodifavevimozedizow.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/kulolurugo.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1508838802613210c7b71d3.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/74981789667.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/wewidap.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/zufolajafeza.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f23d0fed4---duludusudabofin.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132676b73ea2---71328283798.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_off0000dc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 17608 bytes
SHA-256: b87a7f51abed7cbbb589520c12643b6b9c3bcc860250351d28da2fa455b2bf34
font_02_sfnt_off0001227b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227B 10200 bytes
SHA-256: 1e1cc6dcfb4d58ecc84af668d859be40f1357d085f90969175a6c2494deab345

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