Malicious PDF — malware analysis report

Static analysis result for SHA-256 a310e20f902a5c44…

MALICIOUS

PDF

85.7 KB Created: 2021-08-01 11:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b7a5019ed90357552aad0cdb03d1f70 SHA-1: 6087c5560a0112e9d06dcd618a98e6c97b5fa9a7 SHA-256: a310e20f902a5c44cd077db2819335dbc4961a25a17b0e221f4834534e447868
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple distinct hosts, many of which are compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://alkanboya.com/files/file///livumofozoxamesonebel.pdf In PDF document text
    • http://tonwen.org/userfiles/file/89809574941.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071aa597dfdb---lemedefoxoxuzuwova.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/xajunilonari.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/34595dd2235984fb1b2f1a0073da9761/lewuxid.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/l89fihp4qn16fpact3vfh9lbao/bapesafamu.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a653f8fa0f---63166143773.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/enoepljkn7k4svsehqs61897d4/6880652572.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/93010528024.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bba7a577658---1737596254.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160858c0739f75---83777540280.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/suxowabafa.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/90681917517.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/2be74d197660eef1150c5d14a46ce078/mowir.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160776382a03d5---9253893671.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/lasibufifobuguji.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/1186839350.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/i7iop6grso6qttd4fgc46868t1/bajipod.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/87520802386.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/46958434325.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210630_095518.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/sajonutidabi.pdfIn PDF document text
    • http://gabortech.comadmin/file/mutudamarakisud.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa4e812e02---rusixurunigevoji.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/18703527299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ncert+books+class+10+english+literature+reader+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_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 17232 bytes
SHA-256: f89e1b15a93cfaafca34b279931413db77e0c4f7d0198dfe685483133341dfc7
font_01_sfnt_off00011530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11530 11380 bytes
SHA-256: 253df5d85785ca6127243f6551aa37b47c10eabc3e6439cb4bb0645f54ddf7a2
font_02_sfnt_off00012f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1