Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9871924159e225e…

MALICIOUS

PDF

131.3 KB Created: 2021-08-13 03:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9aa53068001f17403bf0a17d16c134ba SHA-1: d629ee71abee3340684b6dc203935ff50633a5d9 SHA-256: d9871924159e225ebd03b80c6f52bb1fd0bbc112c6c50e580a652b185ff06f18
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • 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://goldartline.ua/userfiles/file/84008527809.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bec12e9bc10---kimosesawofekewan.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/80326456848.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/gke1l5vdovp2qd1opbani8s0o4/23211263026.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/1731012132.pdfIn PDF document text
    • https://atl-50.com/files/file/lupaxuduvuz.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3386b4d32---rokokoribexopisijo.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fadb8255---reranej.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/faworavuguwavikajolutoluw.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/zubiwexarefob.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/19475933340.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/66305921030.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/16086937902.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/202e746f044e99dfbce96a9782c82be2/33707409949.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/50711359090.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/ce75c2f6b6adb64aa1ac3e74a28e642d/61448261423.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/nadekunerotuzusidafamimub.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b16a505489---wenawanukazi.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/15647876010.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f9dabc95926---83638924927.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/kenajonegixolin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=metrologia+carlos+gonzalez+gonzalez+ramon+zeleny+vazquez+pdf+descargarPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/fapuxux.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_off000194b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001accc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACCC 11440 bytes
SHA-256: 8fdde0e59e9640328f0cb59ac925d3fe34e629126075644faa85188df97c2a2d
font_02_sfnt_off0001c75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C75C 20112 bytes
SHA-256: 8975a53faa4db02e6286f67f4754b308bb98d3aeb19fed229af2545ed330eb81

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