Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2b8c1503c9871e…

MALICIOUS

PDF

80.8 KB Created: 2021-10-12 02:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 9d988c8d940f7dccac06d9f3c408f680 SHA-1: 9f3d54213787c3eca5f2e958c149b7ca4006c408 SHA-256: ae2b8c1503c9871e22d8aa25c4b04be01749fb0c8773c3eac6ec8ad5213a3967
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_URI_IP_LITERAL' indicates a direct IP address in a URI, suggesting a malicious redirect. The 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics further support the malicious intent by pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://naasschoolofmotoring.ie/fckeditor/userfiles/file/6841584991.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155e1c9b2620---85933319757.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/37355732773.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/wevonesafibusipikugatama.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/laxij.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/67208855035.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/latepalejinabefumib.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/towetofuverapopow.pdfIn PDF document text
    • http://snft.ro/media/file/banisobewafixufuza.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/dolonox.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/82069012271.pdfPDF link annotation
    • http://norrlandet.se/userfiles/file/vesulujaba.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/lupuzezazixujuvomezomatog.pdfIn PDF document text
    • http://matemotors.com/userfiles/file/72480840983.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e94f4fbff---32898165860.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/32722360001.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/gewagodirusizixuwo.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/rewuvoz.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/nonimiwawupejujekugeromub.pdfIn PDF document text
    • http://surausa.com/uploads/files/pixojivuguxo.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/85530417881.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/kipajoroloxakozovakomuf.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/bded5778d465ffeadd68bc09e08d64b9/fabasolagagabod.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/kopasizuxosalom.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210905154513.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/5bhJmFgkeCE/uplcv?utm_term=commodities+oil+silver+and+goldPDF 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_off0000d774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 10688 bytes
SHA-256: ee8d09c97a74d9795fdb364473c9b47f2c54224b321abd97117315bbb6e26316
font_02_sfnt_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 17764 bytes
SHA-256: 055d464c60c47c95aead6442ac2c8c957f1d5cbb7b03955a9e623e4894304ef5

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