Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f6cd0b3dd7c0db…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 09:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e01f01208f12d60d681062766a8081d2 SHA-1: ead5e365b0d6faf06d1c2a1faa9f2c2d2a624679 SHA-256: b1f6cd0b3dd7c0dbd7aa3e4b9c7117b79e1489c490cb9759a898ca5dd02c688f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sperrincaravans.com/images/file/79934900084.pdf In PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b32b4f1ea1---wonilo.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/s80ovcauie27ru9i3pdf0o8dm6/19698106118.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/69736888900.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/jebunetivutogosikix.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/56520187009.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210910105215.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/mosebosazudekaxe.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/zefovebilekupokevubij.pdfIn PDF document text
    • https://projetovm.com/uploads/files/tasatupezujolef.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/59138127704.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f4b445510a05e0d4cb94af7f3b02390a/27381319552.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/nifeveditovolumotekaxal.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/44216156552.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/bomit.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/33144883604.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/safatot.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f0846764bc034d6b9dae043347361d94/jezogakegif.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/tazosa.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/94353853403.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318880c1d21---78608409395.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/govukavilujimi.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614427614ea34---54600421886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=most+popular+apk+appsPDF 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_off0000d40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40E 18008 bytes
SHA-256: 9ba30095713aea0588dca264e50532d133a20767343827f130dcd38a4dae7f0a
font_01_sfnt_off000102fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B13 10104 bytes
SHA-256: c4c41b734d95199f71857ccc6b0ac68fdbee76849470796636bed9205e3ee7af

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