Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a673879be36c44…

MALICIOUS

PDF

90.3 KB Created: 2021-10-10 20:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 669939dea9f26cda53a3f419ffff30ce SHA-1: 5feb45578517bd52248ee786b7e460a7024b8679 SHA-256: 24a673879be36c447026f94ffd7e89e802315b12ce4ce412b761e2645c7d93db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads or redirecting users to phishing sites. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 https://posaonakosovu.com/ckfinder/userfiles/files/woxuzi.pdf In PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/sijejunajovigojasetutodat.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/1450906663.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/legapolujodevuxi.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/faged.pdfIn PDF document text
    • http://df-2.de/images/daten/file/45309957696.pdfIn PDF document text
    • http://schokofontaene.de/idata/59435290665.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/55384792816.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/fatibe.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/radapitasu.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/pegum.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/50006784162.pdfIn PDF document text
    • http://tochuchoinghi.org/files/31941494137.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/21777227376.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/43799597047.pdfIn PDF document text
    • https://questfran.com/broker-site/files/files/84754020300.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/tozuwijusugezeku.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/nageveremekupozogujito.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/89542064296.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/badosajuzaravoli.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153d72a2cad8---zigisodiverafotas.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614379ffd751f---rofibilexolilexeguzisema.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2bacq56lsigiji7qrp3isali5i/99612421972.pdfIn PDF document text
    • http://kleiberit.ru/files/file/2957017317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=public+administration+n4+textbook+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8ED 11380 bytes
SHA-256: 75d8d342d3c20fd15a0ce5fda0d9d03dba9326489a436a1eb3261b609df21de9
font_01_sfnt_off0000f3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 16168 bytes
SHA-256: 6cba6677bde0f241d5abe4bd1daabf497e221bd6197b657de4268e87bbbbfee9
font_02_sfnt_off00010945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12157 22260 bytes
SHA-256: ef16230f987d311ebdcede3630968e271963fc7aa12541b9ade29f1b4ea4c6c2

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