Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f540f50cc1e4c8…

MALICIOUS

PDF

98.2 KB Created: 2021-09-03 13:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26ebc4a53514bf764559dc425f77cd98 SHA-1: b56296d001aaf105cb1f3c87a85728e45d5f2a8e SHA-256: 12f540f50cc1e4c8aa702ef43faa06017dab6f14efab4e40b9bc475c7de80eae
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm heuristics and the presence of external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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://aulacvn.com/upload/fck/file/80199200726.pdf In PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/as6eanjg4gcbs9fhhpqct5mtfh/52364688878.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/34783935508.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/17084162822.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/gesesolifojomoraxofew.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/sarabis.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/karidulobutesiwife.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/mixivusibunudi.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/bejebolobu.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/muwositazupu.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/29095096227.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/bd93dcc6278ec8f1a198c97c75a5435d/livukogimesoda.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/14197927701.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c065121259---nawinenubosel.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a651052bff7---kodebavuveluwavujufewasal.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/1fb2aeqij93a158ggvqp2va8m3/3553036564.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/26273343550.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb41de8784f---11826362456.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/73942865687.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a958e5638a589ef3404b8bf14ebecd28/barijewowilo.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6480ebb16b---74602958021.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985be623374---mopolakizo.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/tiduluzavunuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=asura+in+early+vedic+religion+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 22328 bytes
SHA-256: 3e3ce26dd8aaebffd8a757ee87bffbca3a5bb3d2e15911b014864e3c07fac583
font_01_sfnt_off00012994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AB 10956 bytes
SHA-256: 7f6edeb638cec38e30553f25a66d33cd7d0a302b58e413a92a6212dcf44f41ac
font_03_sfnt_off00015afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AFB 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off000162f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F2 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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