Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d3b458712f3207…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 12:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc327ad86e14b4c8ebdc053d90530444 SHA-1: fe95c556e6c62aacb5b10f6d97157ed9a85fb929 SHA-256: 89d3b458712f32079f4817f4280ee8101949b4c07c33c43c21c5f002ca7d5536
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to external websites, many of which appear to be disposable hosting or compromised WordPress uploads, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://philabc.ru/uplcv?utm_term=difficult+comprehension+passages+with+questions+and+answers+pdf PDF link annotation
    • http://xedaptheduc.net/app/webroot/uploads/files/lejemitetowutesib.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/6047721373.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/pisekikag.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/pududexujegilisewuxawib.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/lukozidizere.pdfIn PDF document text
    • http://tochalco.com/uploads/files/sigemekinuf.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/18391834538.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/83286537355.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/jipobojozeta.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/42183331648.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613838c8efe61---kugavopojidabovolabeneliw.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/poriwam.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/66217188830.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fd549f313---ropigegonofanigewafutivo.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/cf38d6c970d7402adb544143a2276213/gefovowum.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/sukixovukasu.pdfIn PDF document text
    • http://polipack.ru/content/file/najusipof.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/77758114593.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/7592784791.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/sorevo.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/pekojalajaduve.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/vuwenagiwatoje.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18053975209.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_off0000dcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDC 17508 bytes
SHA-256: acab83271745a7891a17d6f64c71bc3faceab1db0b2f37ff0a3b29ff37fb2d59
font_01_sfnt_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001223e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223E 11400 bytes
SHA-256: 765b36e42b2aeebad8b1d8214c2982f2bf670eff3841d82ec721ed8f8cc15bf5

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