Malicious PDF — malware analysis report

Static analysis result for SHA-256 833298c40be5686b…

MALICIOUS

PDF

96.8 KB Created: 2021-07-25 20:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad6d4af120ac8cde5b6fed43733a6cde SHA-1: daf29c63f4ef2a8308ebc46a7102e1894e9f366a SHA-256: 833298c40be5686b29837e7c412789ffef35d4b3a16dacbc525e084e2c4e5e79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/00m2gfu316etk2vpe8s3d3q33k/33077042067.pdf In PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/8e26215436575ea032130e50c29dd319/fisezinefodo.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/44610271760.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/nebeg.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/45c9edd215a450d764608221c75cfaa5/zawogas.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3bc2c8e7dd76d26ec3caa1cc06385f38/18478867168.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/pumofozober.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160714158dd096---63814466320.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/8e3658a108fa3c2903c2166aeed036e4/71464900239.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/74554906379.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/71829241003.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/zuzavikubelutulupelat.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160890e2b7ec51---25427049736.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe6a1cedff---satugeji.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/mefuj.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32e2f7f5d1---79883271252.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd16e661dd---17667634828.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/23202662294.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/zonovufesupizi.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a0655a169096df77c08648e2861f4de2/52843584111.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd7178b44---suwepi.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210513072605.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/0ffb64965352693282af62f9040a5b88/44298352353.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/vadul.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/49124341876.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/kosomutarejegifopimizif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=who+is+the+richest+man+in+the+world+right+now+2021PDF 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_off00011231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A43 18716 bytes
SHA-256: 2f62aa7a99825db666fae8584a8c361ed69c7914b9f5d0eab74c9e98a7f29208
font_02_sfnt_off00015a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A50 11188 bytes
SHA-256: c89b6b2e7a7109caa4ac63098095d62437e70a92427d241df8aff2c369acc22c