Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d9c5f7e37a9e72…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 01:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 853295a5ed89d8462754ff089bbe0bd2 SHA-1: fa0214f001bafffd76f8f62004f8f2e09b47294d SHA-256: f9d9c5f7e37a9e72407b35cfef06a89fc6f3187de85ad045c7ac4686ef05c68b
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, impersonating cloud document services to prompt a download. The presence of a 'password-protected archive handoff' heuristic strongly suggests that the user is being directed to download an encrypted file, which is a common tactic to bypass security scanners. While no scripts were directly extracted, the ML classifier and ClamAV detection indicate malicious intent, likely involving the delivery of a secondary payload via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hpbjahlrut0glb7l2e55j3atp1/27591366621.pdf In PDF document text
    • https://martabaktelor.com/contents//files/51590722626.pdfIn PDF document text
    • http://soles2walk.cz/data/file/jopaj.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/02063124428.pdfIn PDF document text
    • http://millecolori.it/images/file/dabopeto.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/37137066652.pdfIn PDF document text
    • https://olterus.info/contents//files/sufumokepuxepomuzaguwew.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/55304466317.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/kofebipori.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/54759072920.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/numetanizu.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/mibabozudirovag.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/cb0dbaa54472c6cfa9480d59518b040d/likiwatunuxitefivo.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///12231167972.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e400c35e60---19033329701.pdfIn PDF document text
    • http://juentai.com/userfiles/files/63853011150.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/66076788672.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1a0jtjl5j2imckkkf7ii5773de/18672217076.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/kigurir.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0134c748d4---37057180760.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29a7dbf6b0---9441393372.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/regovukibedezudirokudaga.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/47585aa5a01cb3e724e13f32f9dc027d/16119576494.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8eed9a1cd---82365191050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+can+i+read+pdf+files+on+my+ipadPDF 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_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 17784 bytes
SHA-256: 4f64af2cfdbba3f92896fc31fef062f8e7dfc84c55a3dd9ed23d0503606e5250
font_01_sfnt_off00010808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001201f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201F 10876 bytes
SHA-256: b1adfca8525a9b4cde6d764396cd8157c28220416edccdbd99894c170975c017

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