Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8bf55247367bf38…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 15:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b96ba9099f90b2395cde0fda7bfd59a SHA-1: 3811c9476739ce0ebe52b255e5053352206082dc SHA-256: d8bf55247367bf38e8607b8e2e1c6c57d01a597017510cf21d840b9a3dd0d318
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The numerous URLs extracted, many hosted on suspicious domains, reinforce this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://angel-conference.org/upload_fck/file/2021-9-9/20210909021948516431.pdf In PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/luweg.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/91644530432.pdfIn PDF document text
    • https://salwangurugram.com/files/42631413437.pdfIn PDF document text
    • http://sql110.com/pic/88001005039.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/janir.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/10463525059.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/wofotidowefubekij.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/5302773792.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613afbc0cb19a---26679808711.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c036daee46---pivaxanozejozuv.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/51338706735.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090605214773499.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abbeed8f22---vagojiwomawugaxu.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/73796973124.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/furunepon.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/22290032107.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/tididuwepagipobekela.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/87022041446.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/poporanujiwinuralobufasar.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/81196719119.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/dokojosidomabibujoto.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/6184781731f1a32d8f63581954ed2658/70900736866.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/dobowaxavisako.pdfIn PDF document text
    • http://gojjang.com/uploads/files/fusejujazitavizivagejox.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/mezotegir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+can+you+do+with+dragon+breathPDF 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_off0000dd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 10868 bytes
SHA-256: 6141015c4766047be11ba81bc8bec478f16cfede3bac8fcfb20ed44f029dace8
font_02_sfnt_off00010e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1B 17904 bytes
SHA-256: 56bf89b5ed79f4252dde2ba4114bdae76770ee44914f8c0d0431790aab0cec51

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