Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a2ab519ad8a2f0…

MALICIOUS

PDF

75.5 KB Created: 2021-08-13 19:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 928b0fec74d1a9fdd0fb90d0ad11280c SHA-1: 0cbcdb9c7299c849241846603143179e241a17fe SHA-256: f1a2ab519ad8a2f0b27fb7351e3625964e734345140b5f084942e0a9b4da592b
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, designed to lure users to external malicious content. The PDF structure and embedded links strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://arcenevents.nl/site/upload/files/japaludopu.pdf In PDF document text
    • https://12shio3.com/contents//files/rowemekituromejid.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/tibasixo.pdfIn PDF document text
    • https://magerp.org/upload/files/fidalezavadulafu.pdfIn PDF document text
    • http://mrmax.ca/clients/9797/File/2954502687.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/jilix.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/87308498449.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/fusivedesidepudit.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160930df8cb497---96472778724.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b881ce0e045---19073253393.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/nefilanowonudiwa.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210608_74E02E741A8A04EB.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/20252259063.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/nokaril.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/879d3ea1c3ab8f69295c4f578bf59e95/85493827939.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/naniwovuxitawom.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2ea07c0c2---98004988421.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/21101044504.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d8a1bb4af---47703705018.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/h5sdlo8hnbujmffr5tsduoq55t/17037355852.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c339184012f---zojukoxovas.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/16056218523.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df1589b9e0d---47973471327.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/bo9r1fes1v861da0fedi35u942/85442229980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=answer+key+for+2.3.1+pltw+engineeringPDF 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_off0000c50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 15816 bytes
SHA-256: bd987c0831d070192451dfc8bdacff959c7736d4fdf14e5e68f2b66b3cfc7437
font_02_sfnt_off000105f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 11052 bytes
SHA-256: 657c832467c9552337b3d08fde0af109060569e47bdb9c119db8daba10d8bacb

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