Malicious PDF — malware analysis report

Static analysis result for SHA-256 a986587063a66359…

MALICIOUS

PDF

73.1 KB Created: 2021-09-06 07:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 243ccb75de5394e8d64fd21930f79939 SHA-1: cd209473e42d0e05b00fafecf18d91d5b18fea96 SHA-256: a986587063a6635971a788a0cc90eea8a3d4f6cc014a897ccdc6b2f3d07299da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=syllables+worksheet+first+grade
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/8vnq7p02n4m4ci2gk1uo094s5q/faxinolavupomefugupe.pdf
    • http://kepco-group.com/uploaded_files/userfiles/files/19858227561.pdf
    • http://washchienluoc.com/upload/file/kalibapitow.pdf
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/pixoxarewalorubatotujo.pdf
    • http://dnepropress.net/files/file/durabubefogade.pdf
    • http://ruihuitax.com/files/file/muvimadizixesedozeniluti.pdf
    • http://career-id.org/ckfinder/userfiles/files/najomegupaze.pdf
    • https://wildarium.com/ckfinder/userfiles/files/zimidutozutozikopo.pdf
    • https://bizimpin.com/calisma2/files/uploads/43522860903.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ecf2n0rclgebtr3ksj41oj17ip/gogagowovasatu.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e69c9128d5---25783255294.pdf
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/livivulam.pdf
    • http://clean-ecology.com/Upload/files/litodisifimexop.pdf
    • http://theponghop.com/upload/files/mawopezobumesudogof.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/3440349706.pdf
    • http://digitalpolicycouncil.com/imagenes/file/1813879100.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b0421966f58---17946455142.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210815014907.pdf
    • http://childconnect.com/swi/fckfiles//file/89348964281.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8495b061---moneneforokiresatezulofa.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/javixevabenunejej.pdf
    • http://architettoannalisatinelli.it/userfiles/files/3023226470.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba6f.bin
df42307e037de0e55369c8ca5ba2bb1f724ef504038bda24fa4d9da60113fe8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6F 16388 bytes
font_01_sfnt_off0000e50a.bin
c59b8a6bd6c67d8ba8ce309c379a307535bd5bd15f6b06e661d1ee5c1a433660
pdf-font-stream PDF embedded font (sfnt) at offset 0xE50A 11036 bytes
font_02_sfnt_off0000febb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 16792 bytes