Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7e482cd41018e3…

MALICIOUS

PDF

89.9 KB Created: 2021-09-06 01:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 443020eee793b84cf19c7a8776647833 SHA-1: 4735850a0cbc156405cee0bad6fb930a92605eed SHA-256: 0b7e482cd41018e380b420a022986c0bfc3f5cc67b7b102aebe0b8b198c9f3ca
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised CMS upload storage, suggesting a potential distribution point for malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medtek.vn/storage/file/76167049821.pdf In PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0c36d2aa17585d4e9dbd833d224a3dc4/31939124568.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210804104416.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/lakikosajefese.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/koloropax.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/347b82fa4b413c7cc2f8dd9a74607c08/majifuzugadodakomozabot.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2f4895bc9---67429511785.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/dosut.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/7004173130.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/tarupoxevide.pdfIn PDF document text
    • http://gujaratbusinesspages.com/userfiles/file/97749761087.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/75284024671.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/1gpnhnhvmmq3oi35j0qktqf08m/45648079427.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/14443276477.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/84132844100.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba8d5e492---44116372537.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/pugizurikosa.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/zujimevaru.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/6qp2vqrfpaq8fk6jb0dj8i06l6/81619682351.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210813181646_anhwgw.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160731f1f594e3---73571716290.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/b6e6fb973da5734379c26d4d345c95ef/vosugexip.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609693a61290a---vogojixob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=eastern+and+western+approaches+to+psychology+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_off0000f98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98C 10988 bytes
SHA-256: d1b3a483193206233ae00639055e1393cb626c6bda4372e04697055e88366ee8
font_01_sfnt_off000112e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E6 18228 bytes
SHA-256: 9758f423bbe7c94ae483dbf0c70a7d820ebf2dec4348129159b96b2aff71dd88
font_02_sfnt_off00014125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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