Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d23f12777dfd10d…

MALICIOUS

PDF

87.7 KB Created: 2021-09-14 04:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1af50075a71cd9cd19a80f45b6adf985 SHA-1: d99019ee7e83b3c00644cb454cb9f1ff93ff956a SHA-256: 3d23f12777dfd10dbe9157cd6597884d21ec538bac0da76bb834a60a177b9717
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript and numerous external URLs, many of which point to link farms or compromised WordPress sites. Heuristics indicate a fake CAPTCHA, a password-protected archive lure, and an MFA/one-time-code harvesting lure, all consistent with credential phishing. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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
  • 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
  • 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 https://oniceh.ru/uplcv?utm_term=sign+in+live+mail PDF link annotation
    • http://hytechplus.com/userfiles/file/29315474840.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/25474927618.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/68583755292.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/bovinidizaverab.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/82446094373.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/45237150588.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090319023173499.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1bd78cc93---67829946636.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/64575155977.pdfIn PDF document text
    • http://secoinblock.com/upload/files/28980427596.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/rogatoromunuba.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/kevavogekeligages.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/34776433293.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d047b4d23f---75441367172.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/wotalosesawibawufaxag.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/bazukatizojasuxesavub.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/vaveloxoresudoveluda.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c19885527f---38787408613.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3c2d3c087---2516280376.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ohcuctnne1845uo9kucaqr8q8r/pajebirekotexatiluzamas.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 16616 bytes
SHA-256: 06f1d5f5a9083a80364da0885936c8ddb2848b41a67694407b5e75bff462a068
font_01_sfnt_off0000f230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A42 18876 bytes
SHA-256: 37ef5f4fb2d88c8cd58575c9e696b8b29591572bb6ec74851a3ade79aabce898
font_03_sfnt_off00013a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4A 10104 bytes
SHA-256: 3305557d4a69c310f91173c0d03875d2982c58d02d632b0493388b7a7108771e

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