Malicious PDF — malware analysis report

Static analysis result for SHA-256 93cd750799a7d659…

MALICIOUS

PDF

95.4 KB Created: 2021-09-19 20:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dfd3f84e0d736ef60e7ed92d265d6106 SHA-1: b86b2368a4f82b04ae2ba11ac54d18a9c55ab2f2 SHA-256: 93cd750799a7d659472b1af0b28f83c642d140dd0a022e668bc8f595fdd36879
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 http://hyeminshop.com/DATA/files/reduvizabibavadigefifagas.pdf In PDF document text
    • https://best-label.com/upload/files/didogakuzirijefafobuxil.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f291737897---pubakoxarut.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613db5e3cef0e---240070836.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e78c4e1863---kugagiwiganipifuwebe.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/13349313626.pdfIn PDF document text
    • http://labotinnghia.com/img/files/lemifuzoromiparis.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/13661455321.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/78473840514.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/81338965965.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/19474804108.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/84785173749.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/dajajij.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143c9dc543bd---bowiw.pdfIn PDF document text
    • http://nawarashop.com/phya/ckfinder/userfiles/files/vemezigozopudadumidukexo.pdfIn PDF document text
    • http://tecksco.com/upload/files/tilivulavuzefirusiva.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/dudukugate.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210907131302_1668037750.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/vozit.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-14/images/files/44463879878.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e2d2521ad---dubisutaram.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16141f5e75284e---dazugusifu.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/1j4fplv0eccfjbl224ca6ulaaj/61955138518.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/17704559440.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/74650207751.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/66663785165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=como+economizar+energia+no+tablet+androidPDF 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_off00010f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3E 18092 bytes
SHA-256: 465c30e6a881342ec2e28edbb20515be8b2c497a64a181fb876b73abf1dbdaf4
font_01_sfnt_off00013e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E55 10776 bytes
SHA-256: c66dc207ce9cfe87c33b2f8e77257133195f18909e417e793224c7f4c976209a
font_02_sfnt_off000156f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1