Malicious PDF — malware analysis report

Static analysis result for SHA-256 2107f9eec5975b2d…

MALICIOUS

PDF

86.2 KB Created: 2021-07-25 05:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 17941567b718beb0ff4eb82f75fa4a14 SHA-1: bc6f390c5470b758464068d52c5b05e27630c5fa SHA-256: 2107f9eec5975b2dbb17cd47749ba1c6c8515df95e3b8400fbc21180f9234d6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to potentially compromised or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URIs are indicative of an attempt to redirect users to external malicious content, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/q6v5g76d6uvncvh1hp93ugjgo4/kabixutofaratufodefa.pdf In PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d41957c4---81883961616.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/91385645382.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/kfhr658l6st4qnluef3ndjva97/xizikenazufiteju.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160926ed5212f2---44256856936.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/62662927014.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210616_053342.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/f96c2bd9cacc5e50968922d8e1ea72bd/sijopotoditibukiboba.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8d7140ccb---pevuvoto.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/korow.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/8ebcd881c8f00073a3155f5ca4a91956/semokejexeturuz.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/wevawekiwisibunezutatikaf.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/50777834106.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/51439914890.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a8275b03cda---kibimakamufu.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb729abd25---kawejomanulepofit.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/pufonugivebajisazumos.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/iie115ect2pup76c4osrv9jgn9/4288210749.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/33653725150.pdfIn PDF document text
    • https://ottopianos.nl/files/72293580563.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be02abc73c2---jotonujiburovevutezowem.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e215e697436---53509662339.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/vumupadu.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/tebipikotugovi.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e64b413359---35873697114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=fundamentals+of+futures+and+options+markets+pdf+freePDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/19823606884.pdfIn PDF document text
    • 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_off0000e072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF889 10828 bytes
SHA-256: 12a4824ce6e1fd6c07591f4db1aa6fe2ea0327bb5dbe8d95c822d81b53a4cf66
font_02_sfnt_off00011175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11175 26820 bytes
SHA-256: abf79b7798345b543bb9fcbb02c9666797c60352cdf3128fa99144cb2a657a54

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