Malicious PDF — malware analysis report

Static analysis result for SHA-256 99be862ab79735af…

MALICIOUS

PDF

92.7 KB Created: 2021-09-05 20:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 521b5388ca0855bbbe6c68fed0e14f23 SHA-1: dafe009da6d1558bf9d5ee1d91c1fbe67a5c86ad SHA-256: 99be862ab79735afdb705bfed3010d858850d14a9d5cf0939c79e7278a5537be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/d6591b56eb98e4c6f26369e0283b674f/bubipesiku.pdf In PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/besovotokaxitelo.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce42875c45---korusovufug.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16098c6a1d3507---75965561545.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f06e8f6251661ccb683ca8dbb5c49c29/93927896540.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/daxuxarofowebujaje.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/lawukowijebajulopowi.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf70686e44---fobisukavenoborufejodi.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/gagolofuraj.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb04da98913---17798898014.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/vemebi.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/93077793395.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/tiduwun.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091df2180431---18559510291.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210612_003344.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/samulibobafobagutug.pdfIn PDF document text
    • http://synergyproperty.com/images/files/wogazasul.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b409b2416---26062613051.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898eb2b07a6---gilexefipex.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/puvesawafufebuxadopa.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/50569375452.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/08/file/202108220055568905.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd7202700d---diboraragedumenebusez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=brain+tumor+management+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_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 10780 bytes
SHA-256: ef9dc3ef88342ef2c1af627bcdf38dcd7c917939e61ec7dfff156a372cd56d4e
font_01_sfnt_off00011bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 18872 bytes
SHA-256: f048eba49d65bb92eb72835438898005c484bbabffdc46e595033d957ecf036c
font_02_sfnt_off00014ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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