Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30b7902f52f5a75…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 15:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 792683aa5a893b40a524b04ff5818e4b SHA-1: c2d54849e55ba1ed3f204ade18063958eaaf1547 SHA-256: b30b7902f52f5a751fa267e3de30894eb541ee0fe0f042f155e6fd513849f7f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. This structure is characteristic of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://torgradio.ru/new/files/file/70175219473.pdf In PDF document text
    • https://calprin.com/ckfinder/userfiles/files/geriwotibupom.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/bedusel.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8fbb889cf---jiziwabi.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/8291158561.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/lutupoloje.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161326a31b63fc---60740727485.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/68997249895.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/bowagudajemuke.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/46048000832.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/bc47bf407d9a64ac673baf3ff41f2173/xirobalezuxu.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/4646588676.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/tiduduribodades.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/lijiku.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/bulodobakumikaxorinita.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/93710599822.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/siwekazil.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/11504214554.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/92975571095.pdfIn PDF document text
    • http://ausafe.net/images/art/files/6928230661.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/8495490743.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/kujeguzuxasoxaxodifetilan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mx+takatak+app+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_off0000b4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC1 18776 bytes
SHA-256: 1296facff6cb1b1d6ba0277efa20a6f2d652f888d7ff3d1091581ee589ae9479
font_02_sfnt_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 9672 bytes
SHA-256: b38077fb4787f9569a326daef92a5b8cd2e1e73a4caa54ea2f69169bcecd649d