Malicious PDF — malware analysis report

Static analysis result for SHA-256 1146092a58374158…

MALICIOUS

PDF

81.8 KB Created: 2021-06-25 16:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efefc06714e0493acc5097f6aa57de9e SHA-1: deedcd291c0668fffe4eec51cac471f787c168c1 SHA-256: 1146092a5837415823abf5f73167cc6a67a1a84b1032d98553f9cdae6f1f3dc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a likely intent to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/55uc40bc159h33nsdp0d2l6n8e/79368514413.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a64148b4b4f---9712804463.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608104d967590---88256473581.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8f5aa6931---56977912921.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a484932be24---75592174388.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/4u92nb6c1hiciat6bmochdi7js/65149665041.pdf
    • http://hanhthien.net/uploads/file/buxutegaje.pdf
    • http://vetcarefoundation.org/userfiles/file/fetexanaxesetoti.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/4979d8eebe645e1d50bbb4f3924a6ec2/gefokonibujufeziriva.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafb7fa4186---rewemukaxumipuripuriwovi.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/felebumavotemusonagomux.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/35614e5b6e8e42e16bc2c4ff4df1460f/kedojuxupofunesaxot.pdf
    • http://lab4050.com/upload/editor/file/85805004848.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c90f1ca222---satoloxajojuji.pdf
    • http://burchiellati.com./file_fck/file/pisug.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080976c93df3---wabofaluwasug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=wacky+history+of+the+cell+theory+worksheet+answers
    • 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_off0000dd33.bin
28fef346b29d5838b77da6fdaec3ef11878d9727507735d248bbec0c79d77bdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 10720 bytes
font_01_sfnt_off0000f5e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 16792 bytes
font_02_sfnt_off00010dfa.bin
218165d9dc7393cf6ba4bdd7cfb72c31bf6c0dc08c1dad36bfffb36e3e8b4853		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 17100 bytes

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