Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4440d0440fa17b9…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 20:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f3aa3d24496d89929fc07b1ad5e6f8e SHA-1: e786e4c0ee0e71f3b8b93a25de168335f9eb6957 SHA-256: c4440d0440fa17b9e1745755c3dc5cb660d7eae9e4ceea6a55964faee36eb51c
156 Risk Score

Malware Insights

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

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, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure itself does not contain executable content, but rather serves as a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4a6a8e482190a55a5fdf329823c1be39/99425632268.pdf In PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/takilukogaxedogalaxi.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9159b37db---fibodova.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093f361eac3c---33752857682.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/jujiwudopegur.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/pomosapiwibubebokosigax.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/46967390815.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/niwufuk.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/5bee636c085ca0ef2f3df5fb11c0d37b/65132154499.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/52595696283.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/gatafuwuvijojufuro.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/subikutaxufuzorukafu.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63fa6c1a2c---70102800908.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/36041662221.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/foteg.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/5f4aot13f4g4cenfk5vnged21m/berozajilela.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/sikatoxuvibewelesupe.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/82398453798.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/085f9f532854f666337ae59e540a2376/7403942708.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f979049fe---58209445985.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/h05run11h621r1lnruo6tif6sc/gofavovenixo.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38c74b82fe---zotepejevoj.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/sifixixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=t%C3%A9l%C3%A9charger+pdf+gratuit+2018PDF 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_off0000dacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 11224 bytes
SHA-256: 7f337d812ebebed4a9acf697ad4c4ecbb9facc38854a0c6cb449b5432924ac79
font_02_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 20804 bytes
SHA-256: f1acdbe6f1ac5b2f429ee897ef4bc54ad36e21edef9c15a8775ad7729254ef28

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