Malicious PDF — malware analysis report

Static analysis result for SHA-256 d061d645fdeca0b1…

MALICIOUS

PDF

88.0 KB Created: 2021-09-22 22:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: adbb0a4ad261df6b01ec56d5f71a3646 SHA-1: d40f189f39380caa3af146714b92d2d3699e10ac SHA-256: d061d645fdeca0b1a9bab81be7634ed069744401e1476a4b7c45076bf84d00c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://mma-montessori.com/admin/ckfinder/userfiles/files/bopegiwile.pdf In PDF document text
    • http://siamsankyo.com/Uploads/file/10075047833.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/8471948620.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/63595343301.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/61386790007.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/megimotaxaze.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/92492677243.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/63367024666.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142208855169---71177563626.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/96150908705.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613022a3c80e6---tizimulamuf.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/23771ff675c62144ea6daea13215b438/73173711404.pdfIn PDF document text
    • http://obedovice.cz/userfiles/file/12583726098.pdfIn PDF document text
    • https://ceylinpin.com/calisma2/files/uploads/mafewusomavetixebo.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b4cc306adf429672cbb9784e94b7e4c0/munezegunamux.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/68264490183.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/69720127471.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/birawaviwuvilukafakimesen.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/99687187366.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/40302070495.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/sodanaguvotenolodurop.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/58478441522.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/gugokukinogule.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/9100835120.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/widagugimovelosi.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/venipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=moving+files+from+phone+to+sd+cardPDF 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_off0000f2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 17616 bytes
SHA-256: 8cb10fce0b41836676bbe1b5895cb0ff58405a1157fb6792dd269ef55f113472
font_01_sfnt_off00012029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12029 11128 bytes
SHA-256: bf9ed548663b2bd96d3579bc4ec493b2a81f705cf047eec9cddec8496cf48b4b
font_02_sfnt_off000139cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1