Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5bb1e5e010bfcd…

MALICIOUS

PDF

105.3 KB Created: 2021-06-25 23:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 36e65cec885b87fe426c2944f2e6dd0d SHA-1: 4e79eb8ac5235cb507c455315bb69be221148e4a SHA-256: 9e5bb1e5e010bfcd96d2475fd699ffc12f4af0bfe16b84788010e4d455e2410a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting a distribution mechanism for further malicious content. The presence of external URIs and the nature of the link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e2398f2e857a83bc1074defe17a1119d/wikisanowujed.pdf In PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9970b886fb---73360881515.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/bobodutenimanunobobokifa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d06fd4cb7bc---8562999307.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903b7126a9b---99727476090.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e2ae098ac4abe3f26e79fb08bfdb8451/vinuji.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a8600f9f2---fojatekenum.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/8f3ab6476853acaca0efe9f4144d4298/lutobemetukoretin.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9d6f36404---xurobego.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afa9c5251d1---judawuwudidabafenewuk.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888e0edc739---84039179157.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/72088789033.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/9355520780.pdfIn PDF document text
    • http://ha-sine.com/d/files/61335290948.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/fe745d4b862cd7e99da192c748931369/dupoxomigukalim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35108252e4---nuvokokejifodukodenif.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a33e7154c---semitejivamod.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/8651253255.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3430b92f5---webitaw.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/tixikeletovumumebanek.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/adcb007560ec8751ab6fcf930bb2e57f/mepudezoko.pdfIn PDF document text
    • http://cga82.com/admin/File/vulitozomekov.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/9cekfj6et4dd0qq9g6tvrg83gg/xufabuxiv.pdfIn PDF document text
    • http://santeh.md/img/files/40799416242.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab85f871906---noxipavekatejajapopesira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=class+answers+persona+5PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D66 18372 bytes
SHA-256: 6d74f2adcfb0f849b057d68de931808a1e7f6c36872f01655ee0a36cf0e2188e
font_01_sfnt_off00015d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001758b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1758B 10304 bytes
SHA-256: d4c063a9bf7bc1e256d46c7b857aca79413e3003faeddd33486ba97bfa830e9b
font_03_sfnt_off00018cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CFC 2432 bytes
SHA-256: 870ffb83fbf5fc005c3da539d80c3c6557b0bf3f91d01c3971b0f853de204f3b

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