Malicious PDF — malware analysis report

Static analysis result for SHA-256 964b22f354d6ae83…

MALICIOUS

PDF

85.0 KB Created: 2021-09-16 21:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c923d818ae8a190941ac9527b57bb29e SHA-1: 04843489e91ce76864309409ee95c2b25fdaaf60 SHA-256: 964b22f354d6ae8350315393b45462d65f016c37cb22e1e72f1816ba25ca3800
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This structure suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting PDF vulnerabilities or delivering further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/8e320706ef51a2945ccd884bc2992edc/48791105252.pdf In PDF document text
    • https://its-bulgaria.bg/files/file/72837558484.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/dubusugemafisapaw.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/temowulexun.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/xajif.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613600372fdf6---57208893102.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/jemakarutuxokiwumador.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334f0e5bb69---79203505874.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/jimuvivuravajatimed.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/14045411058.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/wuvisoseb.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/juvobuwonofeji.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210907_99001BC5374ED664.pdfIn PDF document text
    • http://elitacasa.it/images/file/12229060221.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/39217660509.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/2b5ca0e23a5d7055ba41156764eb902b/kenomejuvop.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/53612268842.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/60270572920.pdfIn PDF document text
    • https://codecs.ro/images/file/bizirekifabude.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/12119662033.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/66316900713.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/xokotiwepipapurifo.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/bugosufuwi.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210910_105702_5787.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b9b832814e37398f3660ce3e6ad82f0e/60940874600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+adobe+sparkPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/mawekitifuwixut.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_off0000e162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 20060 bytes
SHA-256: 4cfb2b95aab806d27424b36bef400c3128d4daa9e76462fd54382d01f4779218
font_01_sfnt_off0001167e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E95 10456 bytes
SHA-256: 41636c110de6fadcd046dea723cfff9bfa524a7f169b37bf819d191accf30ba3

Open this report in the interactive analyzer, or submit your own file for analysis.