Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e08733df6a416ba…

MALICIOUS

PDF

76.6 KB Created: 2021-09-20 02:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9691a060f7e47023793e6a702274a49 SHA-1: b63f86275731f5ed8e59b51938827ce505931a1a SHA-256: 9e08733df6a416ba724debc263690b5ca3b90caeaf719b88b46ed98af4d6a78c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd40f26c94---mafiv.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147546f019d6---gudupefilalifulorapamilix.pdf
    • http://redeyeldn.com/userfiles/file/78621766396.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e24515d238---57804621169.pdf
    • https://temahr.hr/files/15352961255.pdf
    • https://www.meditech.cz/ckfinder/userfiles/files/mefejuwixelej.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/097bf64e4ada3ba15780ae4029eea1b7/60295384425.pdf
    • https://olamare.com/img/uploaded/file/dopazinewiparimunemiluxa.pdf
    • http://yas-center.ru/userfiles/file/fodolodujunekomafuwajef.pdf
    • http://animationcoach.com/userfiles/file/68722368784.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140ed9e6d612---sabog.pdf
    • https://nacituran.com/userfiles/file/nanekaxenidi.pdf
    • http://wjcopy.com/upload/files/31431638810.pdf
    • http://www.julietlandau.com/fckeditor/userfiles/file/16035429951.pdf
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/55146481675.pdf
    • http://hatowo.com/app/webroot/uploads/files/vusivowak.pdf
    • https://phuquiland.com/upload/files/23932370810.pdf
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/podofituzufomevuzasi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=transfer+file+to+sd+card+android
    • 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_off0000ca1d.bin
3bc0174ee5120eef4a19464476e7065bc7d1dbc889dff1047f948a35b10c48d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1D 10432 bytes
font_01_sfnt_off0000e1de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 16792 bytes
font_02_sfnt_off0000f9f0.bin
f50061f26646bf56276b20ace3688a090fdd45e6a32710dc95dfee2d4b0130ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 16860 bytes

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