Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b949b5dfd36438…

MALICIOUS

PDF

95.6 KB Created: 2021-08-22 04:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 536eb843d87b1d06c20ad33c9bdc754e SHA-1: f53039ff3f1997710d0d561eacaa3d96d8f5456b SHA-256: e2b949b5dfd364383888f2b13754960d2f100c5cdc1999a14e71241fb9bb194d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites, suggest a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://archism.ru/uplcv?utm_term=how+to+reset+tp+link+range+extender+password PDF link annotation
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d449534dd---74912495264.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/debojilosorabuge.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097116122e2a---51959394403.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/91174651380.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/72002966584.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/wususu.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/fijemosipapujeg.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/63948816336.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/sf3ik7rcra9k4u58ac3cj4pm0r/wizivuzi.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d64c90e41---duvuwezubuloga.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929f9e4de4e---31517747266.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/ae1449d66e78f3690e32c2d83b84789f/bireliserow.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/guvutemezoge.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/21607024596.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095d4ba6b52f---lenegezebudamixitozes.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f375b86e5d---52252740347.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/78826908302.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90a3803763---rogekotegujel.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/86608865090.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f8c178ff---3345291727.pdfIn PDF document text
    • http://hamandeggsclub.com/clients/e/ee/ee862789ee8b59d3f3d22261ccc35c80/File/65434108843.pdfIn PDF document text
    • https://vestol.bg/files/file/sesajexikelaxevafog.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/27252778200.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C9 10840 bytes
SHA-256: 2801c238e72c498717632ee2b8bb2e5966d134e878d25c25f623aba034f8b537
font_01_sfnt_off00012aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABA 17156 bytes
SHA-256: 8dac4a972754eece57529e1499cdb50f33922c4feaf89b35aa1a0a4e48cf8c76
font_02_sfnt_off000157b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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