Malicious PDF — malware analysis report

Static analysis result for SHA-256 e602f81b90a54cc2…

MALICIOUS

PDF

83.4 KB Created: 2021-09-23 00:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a2f1a76094b7e40119d3372b48e2808 SHA-1: f50a2571f4525e47299dd5317c5f5da413f19439 SHA-256: e602f81b90a54cc251a4ebe1ce466b21f9736e0092735a15ad7291189302cca4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://cructi.ru/uplcv?utm_term=watch+bachelor+in+paradise+season+6 PDF link annotation
    • http://texmet.pl/userimages/file/solep.pdfIn PDF document text
    • http://blueyee.com/upload/file/042029082195.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/bezifamubidujekavovis.pdfIn PDF document text
    • http://staropolski.net/Upload/file/wovoxulid.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/90491561013.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/2449740165.pdfIn PDF document text
    • http://moneymaker-gold.de/files/xunipabapiratubumofo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0334e51b6---fafogufalasotifuwu.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd0ac1bba0---tobedasurasuvedipu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161483d1233ba3---36513890507.pdfIn PDF document text
    • http://semanbio.com/upload/files/xakafutejiv.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/96699405126.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/gipur.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/janatusilamerekiko.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/jotimezofinakudozopa.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/38724792431.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/nadagonaloturelebuxamimo.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/81542026137.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/vapetasemaki.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/39644261912.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/kagobasegojofuxuguroturub.pdfIn PDF document text
    • http://kahasat.cz/data/file/vowuzumavemulurosodago.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/jeperufupo.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/jitovudonivaka.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/39293980795.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/80197799906.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c57a60b7---18361855372.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_off0000e2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FE 10912 bytes
SHA-256: 439ad4037b947bdb5ed0e1c63df1f97a87bccf7933758525a3ccb16058eada05
font_01_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 16852 bytes
SHA-256: 99d10f2951a6b1c06a20bb49a7594fef88fca6201dbb85cc912419c446c6c464

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