Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95314c0723d7235…

MALICIOUS

PDF

72.1 KB Created: 2021-09-07 16:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5adcf1e43591b5808d3ccc2af686a8f8 SHA-1: 3f3b3a04897a74d576fb77abe29042ff615ee088 SHA-256: b95314c0723d7235d64cb8543db17b448517f6e8f51b8038dea09267992a4804
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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 https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125063603ba5---karajom.pdf In PDF document text
    • http://dcbestwings.com/uploads/files/xezafazadafi.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/fawofu.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/zuzedatureduvomus.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/zulike.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/113lpfkfuu12gg78jqm5a19jem/9910759926.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/laxuvakem.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072893698c66---44607191863.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/jorefogoxu.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3eb56e489c---pupovedod.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/30155307352.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/26306637638.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/cdc3ee55ed0c113eb1de5e26924c41d5/tajifubid.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/jesapij.pdfIn PDF document text
    • https://isosklo.cz/uploads/sovisitopevobodijekofel.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e93120f74---56726930320.pdfIn PDF document text
    • https://buka.ru/sadm_files/kedunipajujejoxebilumere.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/53183531730.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/6adv9mjlqro0nsibeh0588q4c1/womulowe.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/m1poce4k7upv7fftr2rhafvqul/kokufojan.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/v5sqqb3ur4a9vhpd0lnffsh317/72414083463.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/48809546477.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/7834355003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cbse+class+11+biotechnology+syllabus+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_off0000b788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB788 11236 bytes
SHA-256: fc699d54140675d7ce6357f764d31c98ed19ea7e66e39b94850dda3d264d9b0e
font_01_sfnt_off0000d17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 15616 bytes
SHA-256: 9879908cab9f234f12498eee2704387e877cbdbd34797349473121d87f98a608

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