Malicious PDF — malware analysis report

Static analysis result for SHA-256 682f20c3c6c0c298…

MALICIOUS

PDF

85.5 KB Created: 2021-07-16 17:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 02e6cb1509fea5f09d6965ce566fabe3 SHA-1: 9a909d2e6ee35033bbf3c90cce640d00f29e87fc SHA-256: 682f20c3c6c0c298d6fd6635648c34aac4140d84edf454879fffa9d2d4a0f385
196 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document's content is designed to trick users into installing malicious browser components. Several URLs were extracted, some pointing to compromised CMS upload storage, indicating a potential distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/6be415440117ec0860fff4ff0440caf9/87235103507.pdf In PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/pupurixore.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/tekazoboraluvo.pdfIn PDF document text
    • https://iwistw.com/upload/files/zimogenafazavodinu.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768a1e65503---rafojixe.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/61728440fa5f4fcc875fc8cecd94f71e/63242107593.pdfIn PDF document text
    • http://www.bandungmesin.com/file/velonujelinano.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/3ca787975f6c7e84868462303023d77b/67747863075.pdfIn PDF document text
    • http://vtaky.sk/media/file/77762927506.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/26154443872.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/rosumewakezokibixe.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c384e95303e---69435255243.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0ffb5647f---10522492313.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43585240c7---3243411135.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/45549908215.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/pr551a27uqk56n736etdvig6tj/zataviwuvewadumanuzi.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/db26b199a0bb8756d050b06b0692d511/13293857681.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/9200913569.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/23859625737.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/kawigukikerasidonawipi.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/titefapir.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16085b45b54fe7---lutepogipabevebozebi.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607433e435fb3---xemudutilejixega.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd26084592---20389778564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=computer+knowledge+pdf+for+bank+examsPDF 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_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 17388 bytes
SHA-256: 2cfdc1c5c1d36f93faa725c012d8a91311a0f58e3aeff1d177d253bd345b8ba1
font_02_sfnt_off00012e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4B 11300 bytes
SHA-256: b946fc9fc538a288d677cf37c4026e607ce147c678ab97f8bc34e41f089d3583

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