Malicious PDF — malware analysis report

Static analysis result for SHA-256 267cae1ebe0749a3…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 13:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6cfe0cc5d99ea3d424ab6a9d9382e1d2 SHA-1: 61869d4dec0ca5325ec3b19ec9260bcef3a49f8e SHA-256: 267cae1ebe0749a3f78a97af68f5228ca875868f4bd1e8a9ccbbb1d3fda8a77a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms and disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://southernwashpros.com/nbloom/fckuploads/file/92500957331.pdf In PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614963b8f1ef9---bagidonurefilerovopogokul.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/diposu.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/nebetudakak.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///91412683413.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/bakejemezepunulegovaka.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/83272806630.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/69591965077.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/84834365531.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/96538578496.pdfIn PDF document text
    • http://isgsrl.it/images/file/pavaxuwunidumed.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/34992267268.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/77075648280.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/aa79e4e9a1714e65e727479bbc587e31/80388444535.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/745083683.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/63687148067.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613718d6ae257---13678875214.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109192237169934.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af00680721---kotirabozadowimuwaparip.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161330ca94fb08---11716748173.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/47ef06d485e79418ba47e9322332734e/xofuse.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/vekaserudelofapames.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=app+edit+foto+aestheticPDF 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_off0000aff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF5 10448 bytes
SHA-256: ee249371538b7126b3da847df41ef0cdfe35117dcfa3704b2f9603ce8108ee0b
font_01_sfnt_off0000c7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DD 17192 bytes
SHA-256: 0420142a0776e2e67b8a59eb386b1e567c6123ebe0ef97bb04ef6c7e6f5e6c29
font_02_sfnt_off0000f3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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