Malicious PDF — malware analysis report

Static analysis result for SHA-256 087f3c956dbcb9d0…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 02:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cfd9ae4b532c1e8e427fc22ce407d46 SHA-1: e7ed71ad3b2344c52f89723c43fb18d4466ec176 SHA-256: 087f3c956dbcb9d089bd6d34fd6cd998f45b38669e7268777567cd37cce6f959
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 WordPress uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe7e523fdb---jozejinov.pdf
    • http://qtjdb.com/UploadFile/2021/09/11/file/20210911_160039_162.pdf
    • http://evpltravel.com/xv_image/file/lenidaz.pdf
    • https://shevtsov-art.com/uploads/files/xamimuz.pdf
    • http://geodeslaboratori.eu/userfiles/files/maxejazorutedukiriwa.pdf
    • https://kaisar168.com/contents/files/zuxoledukuti.pdf
    • http://renknh.com/ckupload/files/ronuxe.pdf
    • http://riversedgefm.com/files/file/42028898320.pdf
    • https://dodatnojamstvo.com/userfiles/file/55813727070.pdf
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/zizugoxi.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5a138e7eda7e7c801aa7e2ed5e6aadf3/62350620064.pdf
    • http://wooshin.kr/uploaded/file/10231904736133c417568b1.pdf
    • http://nscenter.cn/upload/files/95917711724.pdf
    • http://shiokuda1.com/contents/files/44260784892.pdf
    • http://scamps.biz/userfiles/file/13535181104.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/f65d4891d866d5554484d513f7524bfd/ginudusa.pdf
    • https://multimetrics.com/ckfinder/userfiles/files/lobowatu.pdf
    • https://iamtimeshare.com/userfiles/file/wusivigoxore.pdf
    • http://elvirajogsi.hu/ckfinder/userfiles/files/vomamis.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161421e6a3175d---91346934464.pdf
    • http://compsult.net/userfiles/file/64819205863.pdf
    • https://cauthinh.com/luutru/files/69216529069.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=graphing+parabolas+in+vertex+form+calculator
    • 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_off0000d504.bin
220eea078d78fb6d7128b01ea619c8c230b76b858bad1f8f49071a44acf90855		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD504 18696 bytes
font_01_sfnt_off0001061b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1061B 16792 bytes
font_02_sfnt_off00011e32.bin
2d733c4f62be0b65981ebedbc6aac3fdbda3fb3eff74e94d91de851dd7d3f76d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E32 11376 bytes

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