Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24976d54d6027ed…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 23:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c02c98667dea1bd5492de44ff403338 SHA-1: f11bd5e17fdafee155080ff1b9cf6729343319bc SHA-256: c24976d54d6027ed6bf15d2ce77ce833e907d26c4f842a3f6ad08c1929e844bf
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links likely serve as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://krisoc.ru/uplcv?utm_term=memory+hacker+ros+cheat
    • http://hferrynetworks.com/FileData/ckfinder/files/20210913_66086D9C89B2FC45.pdf
    • http://mskabel.cz/UserFiles/File/3715319941.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e60b5b981---kemalutufulufa.pdf
    • http://termosystem.pl/userfiles/file/97807474869.pdf
    • https://homestayhoian.thamtuddt.com/uploads/image/files/lokalozazo.pdf
    • http://uralinteh.com/uploads/files/68896813033.pdf
    • http://malopolskiszlakwinny.pl/upload/File/zijumogamesobovow.pdf
    • http://leaguengn.com/userfiles/file///26833674091.pdf
    • http://mdsalon.ru/img/lib/file/tozupezobofux.pdf
    • http://tuanlongland.com/upload/files/81282656912.pdf
    • http://proxima-design.cz/files/file/lunaruxefunawodipi.pdf
    • http://vipnjl.com/userfiles/files/xipis.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de46f4cf7d---74740455249.pdf
    • https://smartcrm.cloud/upload/files/zagor.pdf
    • https://grandplaza.bg/uploads/assets/file/34389358977.pdf
    • http://fese.in/ienupdimages/images/files/zakomudewotelisad.pdf
    • http://shinyoungvalve.com/userData/board/file/63204774237.pdf
    • http://dekogard.net/deko/veri/_files/xiduxukoketilizonoxa.pdf
    • http://beijingxinzhi.com/userfiles/file/20210903175935_633770513.pdf
    • http://riccaassociati.eu/userfiles/files/zatizudegimigegemelose.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ulk7p342h6ffpa065krbtmai7c/540822652.pdf
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/83953764579.pdf
    • http://conelser.hu/fck_uploads/file/gipit.pdf
    • 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_off0000cc55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC55 16792 bytes
font_01_sfnt_off0000e46c.bin
98bfc1e210ede93e7470502374318df5513db53f7e8bd86bfc2e13b89b5151f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 10452 bytes
font_02_sfnt_off0000fc3b.bin
2461f5f9b19aa4eb2f88725eb777a655bdc9f40b7bf737d15762f67649ea86a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 20568 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.