Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9f97778d1a2f4c…

MALICIOUS

PDF

106.7 KB Created: 2021-08-07 03:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f0055aee6cbd4da284c00bf6fb50a3bf SHA-1: 1a554c1f0ff2cdb125ebbcaa23d12025abc16264 SHA-256: da9f97778d1a2f4c85e7fde079c7eb6b40337d5d30f29d5a65d38ec8fe049fda
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. These links likely serve as a distribution point for phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

Heuristics 6

  • 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 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://crysiq.ru/uplcv?utm_term=find+the+missing+angle+worksheet+answer+key PDF link annotation
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5033c903e---pamaxegukevidibaginuxige.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/937323f7ed40d2d88262aa24370a697b/wipufusadeworugapezitetam.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5a06250545bbb1d7b37f42d4e6cebc2e/kepoxesomeban.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/limobatejototudivovi.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/61817320239.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a326dd3c44bf3aeac55f447c9a03adb3/4124679419.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608707942296a---60786418728.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ed7013b62---79983762175.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788b82f03d7---59995004069.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/80217355981.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b550d07a9---wenirasidavuvop.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/jejijomiwopunavopok.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/141b54eecc754912906a0b820aa301ff/40820654307.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/tizexedipitekodanalojudu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/85965105331.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49368519404.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/pibibiroroliratap.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/43599104408.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/82532400864.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/roxurowagadotupodizeduf.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/nexudowu.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/7cfa0b5a12931660775d5e66a7f3cf32/5563231542.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/gedaratipemutosuku.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/limabetur.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001175b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175B 10964 bytes
SHA-256: db5e4a52273c3bbfae75589b1409fff23346a02519a33126fed6fc76ff2b174a
font_01_sfnt_off0001306f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14881 21520 bytes
SHA-256: 21606372c88942d2afbddeb0130a9978b63a592792cc88533ddceafb80658d07
font_03_sfnt_off000182f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182F3 16592 bytes
SHA-256: a29fa8af007365b37290770864ad9008d76f6ffd10561554076b316dae4225a0

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