Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca42e3eea092a81…

MALICIOUS

PDF

73.1 KB Created: 2021-09-05 21:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c9a0e626e9b50586cf3f57cfd63903e SHA-1: 3633959fd4e2ad7e9f3b311afc5c8e454b934b9a SHA-256: 9ca42e3eea092a8131d660960dbbf88e05a80bdf7d20ef330966893a251d16ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d9d88a0663---45186427205.pdf In PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/27538802080.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/xebodafaledaf.pdfIn PDF document text
    • http://rc-modeller.se/images/file///79755174863.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e5a4d59f0---valotutoliwugogumokagabe.pdfIn PDF document text
    • http://vipdiler.ru/files/file/nolaraluxewagurebobiw.pdfIn PDF document text
    • https://restaurantenunti.ro/userfiles/file/72435377997.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/238a27dgvahbgs0dadbk7avu73/64013829938.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a0afe9138---luvumowisosokuwoviz.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6303552f0---xiwelijat.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/seromofutixokesama.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/dopudadera.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44060749746.pdfIn PDF document text
    • https://webmenuplus.com/images/file/pukor.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/790369b23a98d062044222a511c66f44/fatutojobusa.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c26965b62---buraxi.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075ce0a3d171---rekakedodot.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b3cc3a487804ac68767a5f6dbe271ff8/8754583630.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/92818056950.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/2873695541.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/xegijuzokejuge.pdfIn PDF document text
    • http://matras-devison.com/upload/file/3876002100.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/motukuperukenazapu.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/loguvukulinelidiwimod.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/jibonixuk.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607325c7e147d---damuve.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e1ad731f---mukakez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=forming+and+solving+equations+with+angles+worksheetPDF 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_off0000bac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC5 11160 bytes
SHA-256: 7243d2c8a7c8db4240d9f6b33e6dae99e6645524f497dab076248f76972ac8f1
font_01_sfnt_off0000d434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD434 16408 bytes
SHA-256: 29f4c34f81efd843ea35199d0865f3dd88259dd2b9be3b808bb44baa53e4f5a3
font_02_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1