Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceac5650a2a34d23…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 19:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef0a062c5fcf4d5e03f9309efa2c471e SHA-1: f6c4a733f8975b91ad74c18f5b0b680de5e8afb8 SHA-256: ceac5650a2a34d230c2f802f3067b38970d77069014a33090369c0c45f12f457
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised websites, likely serving as a distribution mechanism for further malicious content. The presence of multiple external URIs and the detection of a link farm on disposable hosting suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://catamma.ru/uplcv?utm_term=complementary+angles+equations+worksheet PDF link annotation
    • https://landtop.com/filespath/files/20210824110154.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/hmajfck2rsu25repe1g18vmej7/narerafo.pdfIn PDF document text
    • https://songhong.info/userfiles/file/kigopaxadivu.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/d70eb451b0000b3c453c1d0ec5a2e76f/dufanebu.pdfIn PDF document text
    • https://wittnebel.dk/file/mitaj.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/toditojed.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099a5977c39c---85315720481.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fbf9beae7---69167159603.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/murariwitid.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/ropadusakolefilakewakul.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609107fe456f7---zakesisekole.pdfIn PDF document text
    • http://darec.sk/files/files/luwemapenovepetesodamunu.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/kifuputubudimezokumo.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/oevhuj9nf9q6sf60l9eqvgh1q3/99165587607.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa09c56b32---sukukedepisiwuxawoninoge.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/29269819171.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/82732600430.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b626a13f9ef242f128093f131cb604bb/1879947176.pdfIn PDF document text
    • http://kustari.net/userfiles/file/32087307136.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/9cb58a3f6b5403f7bcbb74732183392c/48961272161.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/52003530360.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b20e9dd1---98230746761.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_off0000d2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AF 17656 bytes
SHA-256: 1c30720146e27b77d2ddc8d73cfaac903e096b8ba6653344f226b5456ba594f1
font_01_sfnt_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 11268 bytes
SHA-256: c8b078f52bcfd3b1753ab0183b9f6dce54db833187b443134a80e29b59981291
font_02_sfnt_off00011a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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