Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa845de34d173e1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 11:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78003fe6e3c24dbcc02c3dae198392ed SHA-1: 51b00f4683143931c65abbf38179c87b77a7cc59 SHA-256: eaa845de34d173e106de066a4fa95b6903f4379c8a6a104e6035d32d7a2983b7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://akinmedikal.com/uploads/file/rokametuj.pdf In PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/dovij.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/sononateweremamuxosesixe.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c91749e7b34---46206210609.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e20de89c1d34871bdb6040269884d445/tubufunifuxexe.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/h7dpubcuihbd1m3b4jgj7fdrb6/laxanunedozobime.pdfIn PDF document text
    • https://questyme.com/userfiles/file/vesedaza.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/27790440356.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/h34q67hq6kdr59bil7okijbhje/fonesexapuw.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/30004690340.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/19077225463.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160964c0b14712---dusit.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/25041878763.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/18443058786.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/35890691980.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/binonezapopigozen.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/1ee69ondb40nukb7pb99720785/sepagumuvoweb.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/5142849700.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/jaxadalubamebuvabam.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09fd2bd516---93699460024.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/48095450127.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610823bade75c---82955693817.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5opjgvb0k611frcc5deq8nljhf/pigetuxamuvukutupawax.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/gobobokudumipuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=rankine+vortex+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 21648 bytes
SHA-256: e2e5c3ecc45f09c7acf50033e6a82027412eb811d83bce9492f0b2c729bd25c4
font_02_sfnt_off000122e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E4 10584 bytes
SHA-256: 340b4fd5dea042dd04267d3929d5772bb4ff8812a4861cdf8f67a2b2d481c6ab

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