Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d2cfb28fbbb8ec…

MALICIOUS

PDF

93.2 KB Created: 2021-08-05 22:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7420ad2f8d157bb3262744731db2442d SHA-1: 853a0563894d2aa3aee1d1375a301cd84d904978 SHA-256: a4d2cfb28fbbb8ec1864d53de5448a8a5ad59d8db310b30459721c31f69f49e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing or malware sites. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ab1213d89---bebob.pdf In PDF document text
    • http://uniroll.pl/user_images/file/jijipeviwotawimexat.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1195b09421---57922699584.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/59581212927.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/db8fcb79e348147150d31caaaac9cde3/wawovedawesa.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962813ca5c3---37868586892.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/rofuvilagobamid.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/zanosufatobonitizudix.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/p15jt7nns7v16sjfm91uknkf18/mogojunekutadonenofudika.pdfIn PDF document text
    • http://fotobambagiotti.it/userfiles/files/tojijovibose.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160aac1a98f428---zadukadaguvudunisowib.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80aff4c3b2---33049679329.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f42a8a999e3e6364282caa00e619452f/bijuroropijulejebagi.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/zadanuzuniwisibupamip.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/gezoput.pdfIn PDF document text
    • http://asfalon.com/__files/file/45456140194.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d241fc4d7f---81452702291.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/39068863444.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/8777d27bdbbc0b35cfeb0be6c3564695/xufolikarujobepefisij.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160890742895ff---33752085454.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd270b6eda---pisefezorepowaguzu.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/zovogam.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/voxukew.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/48435813462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cambridge+igcse+and+o+level+business+studies+5th+edition+pdf+downloadPDF 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_off000101fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FE 11624 bytes
SHA-256: 8458c550aac060511adc887f53ee8355b8b0b9642103586b93b536a2091cdd74
font_01_sfnt_off00011d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13531 18704 bytes
SHA-256: 49aac646805c6ef17156d6e4b50272a01fdaacb3bb54a46ba3cc45b79193d56f