Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1e9ef227a8d0b2…

MALICIOUS

PDF

82.3 KB Created: 2021-07-05 04:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4df00338db7313f20c4711abcf17fd40 SHA-1: d3ff22b1e03e4db6fae79717efcd5f069be423be SHA-256: 9b1e9ef227a8d0b242581e6f7c38b165efbbab526e28f336362a48483d9c10cd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, with many URLs pointing to compromised websites, some of which are hosted on WordPress upload storage. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://albino-pitti.com/pub_img/file/24738538463.pdf
    • http://novelinternationalschool.com/ckfinder/userfiles/files/sezugaxekajez.pdf
    • http://reflita.lt/uploads/files/bugotiponoxenuxurir.pdf
    • https://transport-vehicules.fr/userfiles/file/4024901492.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/2p6u1t462tp6vs76u5fcl7eido/xikaxawobaxutunagebuf.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/72064bc06951fc287d0ed74ddf54bc42/vusobigedelo.pdf
    • http://hndgyl.com/v15/Upload/file/2021621109144636.pdf
    • http://babywagen24.de/userfiles/file/78558058733.pdf
    • http://solar-makernavi.com/ckfinder/userfiles/files/xudeze.pdf
    • https://akapacha.com/userfiles/file/82549117337.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aa4f2f748---33283310065.pdf
    • http://4bzsoftware.com/Images_upload/files/falelotujuzi.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/funixemamofetorawabezinep.pdf
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/zitosefo.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16096fa4f7f13e---99362486846.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3c39f3b9f---nivoxiropitini.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rehn9s85asjc80757v39olb1o2/voperi.pdf
    • http://hanhthien.net/uploads/file/zanuvebebanajujezaz.pdf
    • http://se-ty.ru/uploads/userfiles/file/27288543109.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4scpe3cro0odpao4jbhjn4se92/17777115681.pdf
    • http://lamachine.nl/userfiles/file/59466112969.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/45027ab5058a6fe3844ba9091e2e3077/nuzasumubapovowod.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6546bb650c---zerevimil.pdf
    • http://stauarchitetti.eu/userfiles/files/53926803722.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=postulates+of+kinetic+molecular+theory+of+matter
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df9b.bin
69a246c44d7180baae6ca92436dc98151f9096092ad7b756872ec24a6c64042b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9B 10908 bytes
font_01_sfnt_off0000f8b9.bin
1ceeb67e2b569014d07c6b95231e2ed2142a7b2d20baa1bb896ae7ecda32a38c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 16472 bytes
font_02_sfnt_off000123a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123A3 16792 bytes