Malicious PDF — malware analysis report

Static analysis result for SHA-256 74142e74fd5f8bca…

MALICIOUS

PDF

82.1 KB Created: 2021-08-22 02:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed3287fad27f931e6aada6b37b762e94 SHA-1: 3dd30a69d74e75d458529dce9c3595b14bdba2f3 SHA-256: 74142e74fd5f8bca329f4f05ff7e2cdec7582418a2cadc1f0337a95b1292fa35
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://investbuild.ru/var/upload/file/nelukoralapejafud.pdf In PDF document text
    • http://aeronautike.com/userfiles/file/lomib.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/musuvumejaninedo.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/59393321657.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/laverufuzulap.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/45995282230.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/80507403085.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f3488f8a1c5---kewugudemejawu.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/nuzoluzivologozomizod.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/s0ofc7tq5ihv270ldgvan4trhb/fevepexunafuporofozudora.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/0d9f0b47315a2191e8408b94e46c25eb/mikipavujipaxelan.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/97550735543.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/61420688752.pdfIn PDF document text
    • http://usmleworkout.com/files/file/29699494047.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/37411889986.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/wofivefezexupebux.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610d96a8b51d2---89736695011.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/sitejidupexax.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/34622904082.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/66882197856.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/aecb6742a799d55b3e8d248f0d49756e/23043156071.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/lbjtlrr4cdrbq436m9s3oe3ois/selidikisapaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+turn+on+akg+headphonesPDF 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_off0000dcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 17236 bytes
SHA-256: 7555b56271cd151c2346197e81b5ac43cedb368ee6ac7d98e4b41448ba5046b7
font_02_sfnt_off000121d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D4 10800 bytes
SHA-256: 8c7d991368abffc7e51de2a133cb8fccb73c54fa31cca5cd49539fc210900b51

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