Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f73e901dcb2cfb6…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 13:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 28e261f3e371de40846bbea30a642900 SHA-1: d219df19573b91909e4e488a646bf640ae57313b SHA-256: 9f73e901dcb2cfb6e5583a5af5f434e1125c13b4a9333522f356125daf4f46b9
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads, suggesting it is part of a phishing or malware distribution scheme. The presence of multiple unknown URLs hosted on various domains further supports this, as they likely serve as download locations for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f18997a653---50994831689.pdf In PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160728369e39d5---94698387522.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2642e7468---jisajiwa.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/jehhke3aagn317k98rbofhbvf5/90803204679.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/3199470571.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/vuvoz.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/mideruzabofopudezum.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/pagajetusafutopoxo.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ccb9f7c39e94f56a7f708866331dd720/xadufapimu.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/65161131782.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b2f7cdedbe643af8cf7a305cb196e2e5/vokadukudetefanapasurut.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/50976087848.pdfIn PDF document text
    • https://deepex.hu/hirek/files/88814132052.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/dd392181745eb1d8a8515b1c9e3f54be/72020675048.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/88886267104.pdfIn PDF document text
    • https://themalc.org/files/file/lanagetaf.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/91901320715.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/60083554513.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/fogopeditofepigedu.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/14925178190.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/68018179776.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/0vsvmoe5pcd98tchfu1omlr8a4/50516682504.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/24630972379.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210723_09337CD2EFE81972.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/e242ecc5298ba93d4f81574dc5ec2f99/nolefefor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+convert+ms+word+document+into+pdfPDF 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_off0000c680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE97 10816 bytes
SHA-256: d5de7077d879ee3b34fe839012473f485c1bce7479e3235d84fea61710cda1d5
font_02_sfnt_off0000f78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 15992 bytes
SHA-256: 45d6936b0a4aea21674ba31a350ad23d482b82285adf1496bfddf7c6aa0dc018

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