Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d8d9cab33fddc1…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 00:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9e14892de85d15066dc68b614d9c5d72 SHA-1: 1b66067658f82bdb73d09ff8c50a1e1b279a7e6d SHA-256: a7d8d9cab33fddc1de695b9dbe8c91a854e345e8a77e049d5a2ac9993d85f5c3
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF document is identified as a credential phishing lure, specifically impersonating Facebook. It contains multiple links, including one at offset 0x8957 pointing to 'https://oniceh.ru/uplcv?utm_term=rs3+account+recovery', which is designed to harvest user credentials. The document also leverages compromised CMS upload storage and disposable hosting for its links, indicating a deliberate effort to obscure the malicious infrastructure.

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://oniceh.ru/uplcv?utm_term=rs3+account+recovery.
  • 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://oniceh.ru/uplcv?utm_term=rs3+account+recovery PDF link annotation
    • http://sabancilojistik.com/userfiles/file/vatepolixuke.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612f889d6e3cc---pofatizepafepigoxak.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16137df582f70a---13744069570.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/bofetof.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/zukolidajesuzuvujadopimo.pdfIn PDF document text
    • http://elpijisystem.com/file/41184684015.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/18400943803.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/45863240895.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/pasopoxusa.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/koloropax.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161303f0353bb6---govoza.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/58297851638.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/93816705775.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/42333331900.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/57241564665.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/80760340717.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/58ulkqmbtqh0vvm4e1titiml59/49083422951.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/lulowuzutotugusajexab.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/nojefixaga.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/mipugovoxitikoti.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/50166877274.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/86177929513.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/54457666605.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/87516838274.pdfIn PDF document text
    • 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_off0000d9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 17184 bytes
SHA-256: 6f45e048b2b8f480588d8777ec114c264a2f749ca14e609ee1bbe202359690cb
font_01_sfnt_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 10580 bytes
SHA-256: 0c44dd3bc0a69c1d33e8779f36deb80a3f0c1e7e39934f19dbbb0200671db268
font_02_sfnt_off00011eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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