Malicious PDF — malware analysis report

Static analysis result for SHA-256 f307d432c8b52cbe…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 17:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a116e0419996e97d4ec2fe3285f6107b SHA-1: 583a2a515d34e9805fff47a446911ee239af394d SHA-256: f307d432c8b52cbe4e72e8716412a42b354ac36e651480eeaba3a4d29e063e7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://chcial.ru/uplcv?utm_term=game+dota+2+di+android PDF link annotation
    • https://megalightgroup.lv/uploads/files/voxebijogo.pdfIn PDF document text
    • http://cocoal.com/uploads/file/41164492805.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144be7345329---nafimuzulojowoxogewofasul.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/roberesosalofutakato.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/mumulexewawufax.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d6eb89fc18cbefb24ea45a5ce80116fb/xopojabekuvul.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/10346461734.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/getaz.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/74162354262.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136495512e87---87251996382.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/35601404120.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/xebizewafunimejulinibu.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/32241c8e35a934f6bbd1456d43ac2f95/wulaxigoxidoluz.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/suwomo.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/sujagiwifamaz.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/medakiwuv.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/49103183994.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/62890405050.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/51862118704.pdfIn PDF document text
    • http://gespk.com/userfiles/file/sidinadijasebevetanelab.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/sozovuzanet.pdfIn PDF document text
    • https://cathita.vn/upload/files/26338310364.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///fabipuwuboda.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/wefaxaw.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/fojazapezelef.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/8te6jhqmugkeu9stc8i6us3dqj/98154835620.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_off0000b238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4A 16764 bytes
SHA-256: 8d5a6161cd3acc1d6d783271450b47567ac0786841576157f775b837616d31a6
font_02_sfnt_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 10352 bytes
SHA-256: 0fd1cc0e5ba490ea4678396a0ad5018718be7728c77d39a279d32d0c85b6719a

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