Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0aefbb523ffb36d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 22:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab1ca81e4fff9e166747fbc9c92377d2 SHA-1: 751a346482a3291f7df4663c77f05a6b3bea58e4 SHA-256: d0aefbb523ffb36dd57cb1cf571b4a31e201733b815432133b83537822aeaa18
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or use link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://motolargo.pl/userfiles/file/jamutitibajamot.pdf In PDF document text
    • http://cn-junsheng.com/upload/file///202185111792100.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/mexupefipidelif.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b5b7fdd0---xekenokiv.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d22920e2f---refaxubigowow.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160877a50e933d---69642637863.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/65770195257.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16119642d2633a---32571622186.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/rinogefibevam.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//munebamejurifexinesabik.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/3492695280.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/66162922844.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/vupemuxaligide.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/74564040696.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a0f83782608eace3cfe4704a3c9f4b6a/66639192397.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/584791e58394ca4db639cea0164ddee0/luzap.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/05/file/20210705_075206_146.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/iimer9u8k5l8bhpfkjoed5a4qr/savometujozema.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/55677609959.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210702093233.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9tt1k618svbj2154t28pr9g022/relagib.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/92203202205.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a859c93772a---tovupakedor.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/posudisijikuvuzoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=romeo+and+juliet+short+version+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_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 16720 bytes
SHA-256: 933a0c58191e07c945129eb06f3de9abb2de2b828789318733cf43f0cd92cd02
font_01_sfnt_off000103b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 11104 bytes
SHA-256: 2122159c6c9415efe7adb1ec570b7c29260b0fcf9c21f61ce87a6013c18d409a
font_02_sfnt_off00011d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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