Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45ece9d3e5feb72…

MALICIOUS

PDF

85.4 KB Created: 2021-07-22 14:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b6a1fa9057c0e34e2cd2d110467aa3ac SHA-1: 3c5732ee627a777cb7c14d1ecace9fdc7a2ff151 SHA-256: d45ece9d3e5feb7212eb21e98a1071fa1cb8ea4d8b04edf8a6ef03ea3f6e0f32
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://4bx.pl/public/file/pumivixebidofajet.pdf In PDF document text
    • https://avvocatoboretti.it/file/97494821150.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/tobunil.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16085ba4ff34ab---sexomoxinamafedisituw.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/kuvowoxedexez.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/s0kn6b21oe1na601ldvno6d443/sabozoradijumasazekisax.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c22b149f095---fidadofalimejinujivawom.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/23700622401.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/40720126980.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/76562635470.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/wuwivuraxekafobomi.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16257354165702.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/62942752243.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cdecdc4e8e3cee14ca8ab759e6014a3d/wurumusalinakaxof.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/c6f2bb3b94a868f41fcbc87903367075/vatopaligodatejog.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/dafutofukibuno.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/18160958284.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/1f2db705cec4020e1ea687fb133165f9/dumisilawanirivazevog.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbc7cdbb7e---7373090554.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2cccd13d44---20562458947.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/90636687227.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/kumebi.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/sonuwijeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=supergiant+hades+ps4PDF 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_off0000e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 10760 bytes
SHA-256: 9ba04b54e24a4b32e74e5ee80d1d483ed0f6c912b7cb11895cb4d27ff44518a8
font_01_sfnt_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001197d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 17920 bytes
SHA-256: 0c31bdb134a1a381336f70eb8a75a77602b381e24b9e2bb5b0b7d0b970aec239

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