Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f81d049558edfe1…

MALICIOUS

PDF

111.0 KB Created: 2021-06-30 11:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c375b1ef7db15d8e2931b51a54ef0296 SHA-1: 963a9d0c3adfcfa22cc967555558f7b77691857d SHA-256: 4f81d049558edfe1101f1accb43f85bff8a62496e2a5f35a4e49cc21472def50
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/welutuv.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dc6f919b8---fegoxixim.pdf
    • http://apsara.ru/userfiles/file/54938608201.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/fsj5fjneaf600q8acsqc9929ea/vuxoxarusara.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vsfitaqejnfcapk3cvmt19c6rj/kiweboteb.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160993ea97c414---87155693176.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/d3be00096b77ca4c53fd8420e60650b3/78759566793.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4e03d551c---mifigobokawizevoj.pdf
    • http://exlluprimebrochure.com/ckupload/files/sukapekorabusuxaba.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5770ff3c15---6367818764.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d13318f05---57112091695.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/dc3e712c325dababeb12eee97d02ccd8/70804129904.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/1518c35491afe759bac2298ddcff022b/68388473902.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/c955367b8d995dfbee46eb6ad73f0910/nugosusizeduvatonejeboxuf.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/6d3de54c5412a7e0b13a0f01a1d7d383/zodikewiwezuj.pdf
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/16207282268.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6abfccb2b5---29719003194.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/e81jlbl809iti8f1efvat183gq/64757174503.pdf
    • http://chocoenglish.com/_UploadFile/Images/file/60957251522.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/fmtr3p8rp7agldldji5ilj86v8/jekegapane.pdf
    • http://studiofapas.it/userfiles/files/nejusarunexa.pdf
    • http://www.77ice.com/upload/files/78105229161.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=national+language+of+different+countries
    • 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_off00014215.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14215 16792 bytes
font_01_sfnt_off00015a2c.bin
f8d2c8a4a842070b4ee6bd607fda894cf20d1d17269c8a49ec0712d64a83a161		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A2C 10728 bytes
font_02_sfnt_off000172bd.bin
d279ee8f59ac8a9ee300f32d9a2936f1abb65d9e1ad57d8072c4cf805e1968b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x172BD 25656 bytes

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