Malicious PDF — malware analysis report

Static analysis result for SHA-256 116e1f24a988f142…

MALICIOUS

PDF

70.0 KB Created: 2021-09-16 13:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a28884f17ea57a55b68b44fd390215e SHA-1: f979a348bd836c6fa23c29e84d17cfb9d579fb61 SHA-256: 116e1f24a988f142ff3956bd666ae9e026320d36d2caedd990996705a42b8909
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://ternovykh.ru/content/file/tufoduwakipi.pdf In PDF document text
    • http://registermycompany.in/admin/userfiles/file/fivazazozijalewadep.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/bamelafagogemi.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/16525954038.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/6cb6dc7df73ba83cede3272354da2b5f/46134128592.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631354583jurexutesiv.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/66751295482.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/66855529064.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/batageboxelit.pdfIn PDF document text
    • http://gekon.net/userfiles/file/momujimozudirulajanimusi.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16317558676946.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613446edb674a---lilosesetirafi.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/murizuxijemaxog.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/pewuvubediwenedulewerugo.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/zamogatenenubarawumet.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/tixifaje.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/zamofuwinavamuduti.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/19115979006.pdfIn PDF document text
    • http://premo.at/userfiles/file/27050636423.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/vivog.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/bopovoras.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/88373273173.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/gujekaneza.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142cd546450e---rimosofowumixamazuv.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/fegagilokufifatadofi.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/60576090231.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425ca920885---kenotudos.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/25146009402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gta+5+cheats+ps4+phone+onlinePDF 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_off0000b616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2D 10624 bytes
SHA-256: 6fcc3ceeff829b13d1269af329d0834c43543de3e777a934bc40497cc0addd23
font_02_sfnt_off0000e681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE681 14296 bytes
SHA-256: 5830d4a235b6fa28f0c1cd254673a7b32dd463d1b10afbb8bdf30ca10628e09a