Malicious PDF — malware analysis report

Static analysis result for SHA-256 411494f4e557fc1c…

MALICIOUS

PDF

89.4 KB Created: 2021-07-06 18:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: c423867ec13f6ed7a03db1780548e2d7 SHA-1: f7466b71eff018eaa0d2f2500206f58ed0815952 SHA-256: 411494f4e557fc1c132d2074d08fd190868c5411f1690dc79c14d8888e023e98
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://www.europesolidaire.eu/userfiles/files/70517100963.pdf In PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6999f7dc---51626419320.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/ab0db58e5630a7ba22cc244577a279f0/wuwurivaro.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/45559821149.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/9489c75dbcda1eaacc68071b9c1fb53d/876128802.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b2f87ddc2---61449743905.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/fb3e3b68b55f152d4ba9ea4d3deb7378/50578433721.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b605b7b35---14210258775.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/74966821964.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/bunusigozituze.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/dojaxezodotiwixikinerok.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/xukenuzuxu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/s8iq19rqc9203f5ivot50h9t26/25232881671.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/13082807288.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608153e2bd0dd---soraloxubigomomolatavu.pdfIn PDF document text
    • https://soechi.net/userfiles/file/99268259177.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fd6563b3---35176959580.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098a18b71d1d---fumelov.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607763c2093b3---ponebevenat.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094b4c923475---vobozafenirewir.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/badazokonoxunatetot.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/38906959123.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/nebul.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/19517152175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+auto+youtube+apkPDF 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_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 10600 bytes
SHA-256: 5459f448fba925448ffee21c895471e2506b53fde0fd651d18aecc65a1a99180
font_01_sfnt_off0001132b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 16840 bytes
SHA-256: 1ae73fb641e7acb175fb73b9680ea8b6122246d8b5d2d1769b330fb4cb8100f2
font_02_sfnt_off00013e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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