Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf286875f6e6f42…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 14:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef663a06fb8bd538a349d5adb4a42842 SHA-1: 0c9290c418f433e46e997b47ceca193066f2e598 SHA-256: 8cf286875f6e6f4201eb8aee17b3458be4e53edcefa31473e48c1aa19299de09
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huefpdf.org/upload/file/22737647257.pdf
    • http://vinhthuan.asia/upload/files/79664833152.pdf
    • http://www.ruben.pl/ckfinder/userfiles/files/pitalisuzuteki.pdf
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d153286b3---27243875565.pdf
    • http://csc0451.com/userfiles/file/20210918151551_cjclgd.pdf
    • https://bold-iot.com/uploads/files/202109080611585411.pdf
    • http://fpempresa.cen.es/userfiles/files/30785765925.pdf
    • https://esofagopisa.it/userfiles/file/10310795358.pdf
    • http://shijijiaming.cn/filespath/files/20210906133437.pdf
    • https://mercerapparelss.com/userfiles/files/lugatevoxer.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3b8081873---51081634969.pdf
    • http://trungtinjsc.vn/upload/FCK/file/gopekilofogoveti.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161408e0a84a1f---kibokazolukito.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2a6907aa9---rolavavofimosusolanexufax.pdf
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/77420860874.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/0mfu4ea7m5o60o3oossemk82q6/kazudex.pdf
    • http://olympusflights.com/files/files/nugibulisewakipegu.pdf
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/xelivogisene.pdf
    • https://k-newsletter.com/ckupload/files/buwararad.pdf
    • http://tomboy2.com/images/library/File/86454108782.pdf
    • https://gemicilojistik.com/userfiles/upload/file/81647714161.pdf
    • http://gr-chem.com/upload/files/banogazuxegegoroviji.pdf
    • https://saglamahsapkutu.com/img/editor/image/file/16322018869.pdf
    • http://archgeo-leszno.pl/uploads/userfiles/files/11420916003.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e736b49f2---segaji.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+cottage+2012+full+movie
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d80a.bin
11fa26e6556166b6601c1fe31806c05bc9449369e32f21b376ad65229b622c08
pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 18556 bytes
font_01_sfnt_off0001084e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1084E 16792 bytes
font_02_sfnt_off00012065.bin
c74ff4e9f454801c9b6d9cf1bcb8a6880e3c7032bdbd6f5d06f67d9fd344b918
pdf-font-stream PDF embedded font (sfnt) at offset 0x12065 10832 bytes