Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc8e4b88f78898d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 16:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cea70ec6e0b26558ffa6709db45ae8a1 SHA-1: f17cb4892b06dbdf177830a21db405e307e3715a SHA-256: efc8e4b88f78898dfdad032abf2457389713a2bbef282f00263e1d8ecab52113
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, specifically WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially compromised sites suggests an attempt to leverage SEO poisoning or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e7a9b503c---jajabupekotatidupafudawus.pdf In PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/setikemikasinixit.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/mobedanop.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4593d07d35---wirusa.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210501232618241024105.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/73268670503.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/bovowibupev.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/xutupefimu.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/35468d46fb9b7b21981b2abc7e3c5d30/febatuwesimusopafoti.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/fukubajurumekovajuri.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/vodajusopizuloravavasip.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/0bf56a86e3cd5c6d5a8fff800327e54c/gufilafuxu.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/91334220781.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/wojine.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/42351754061.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/xitatinorakezigifivovi.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/b41d73a647bde00fc5f65142204f9fb5/molodiz.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/fujupaneviwejizubegelesoz.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/jezotabusilososavoxiw.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079396235d25---51962605835.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/a627b096ded973cfd6d3a689b358bdcc/keraxotovitumemaz.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161289b7667fd8---gefesaduzimewanufamurim.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/84445307723.pdfIn PDF document text
    • http://iphysiology.ru/upload/39812856694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pneumatic+design+pdfPDF 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_off0000dade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADE 10800 bytes
SHA-256: 4c1ca43bfd5da46e847d39f28ded668542bec7b5683f23710b67c492d3916503
font_01_sfnt_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 17240 bytes
SHA-256: 58ef02417ed789c15c6573a346b5dfd381c1b8907de5c898490c4272a2f7af1e
font_02_sfnt_off00012023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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