Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd11b73e44cb51d…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 13:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4c31f89f142191ad7b4a2a8bdae460a SHA-1: dec1d16b4e544a5c62b9d215b209264a15ac9c65 SHA-256: 2cd11b73e44cb51defe61e34eeeff559fe8b0132e91d8d8cf64e8661e277f331
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160998b5257877---puzagomufafip.pdf In PDF document text
    • http://gramercy-grand.ru/files/file/61813155862.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/70je90p3n2hk5eru0t50vbe5nj/98876940091.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/62767260197.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/16532723772.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16100178f23c2d---tuxirufiwesapogu.pdfIn PDF document text
    • http://kco.su/userfiles/file/laburorunigawubeligup.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/51501819387.pdfIn PDF document text
    • http://wjcopy.com/upload/files/vejurukape.pdfIn PDF document text
    • http://kd-council.com/upfile/files/14899802023.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/438a2576c67f6271eee848e6c4f2e0c4/firobemi.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/disosufun.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/dolemilo.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab34785049---31783890780.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099e324d0102---sunavojudibavu.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/50645850837.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/pulofavesafesafebalamaxad.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/c70171ceb57ecf6b0364a4770714c071/jinibolujaxakorog.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/33811378920.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/lujogabolezuvovami.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609e72a4dea9b---54953429614.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/bufive.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/35a73178ed9af0933e8ef8041054d123/zarez.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/4718356259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fractura+de+tibia+y+perone+expuesta+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_off0000dd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 19620 bytes
SHA-256: 3e869d2f88f3efc049b662bc7542f1b5271b4a3305ba138e7dd6fafa06db7ab2
font_01_sfnt_off00010f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F75 11000 bytes
SHA-256: 431d9dd1f283fb5a277138ff86850ccba259aaba6aee5b770944e4c74bc171f6
font_02_sfnt_off000128ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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