Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6f90eadb35119e…

MALICIOUS

PDF

76.8 KB Created: 2021-07-04 02:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 62ec248646b011c74e9fc6f69af76fe5 SHA-1: 7db15f495945034294e2899c97f5a8bc9b8ae392 SHA-256: 3f6f90eadb35119e2391e8fa13b8d670b082ab22def18c41bb76b92740d5faa4
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external PDF files hosted on potentially compromised websites. The presence of numerous links on disposable hosting and the use of WordPress upload storage suggest an attempt to obscure the ultimate destination or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://htlexpress.com/ckfinder/userfiles/files/zoxorinujorabu.pdf In PDF document text
    • http://abpaluso.com/upload/file/gipojuwimumodogade.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/91317929496.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/lalopuwiben.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/953l7a9ddlhbovqoabr949k8rv/javosokanidarubo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/orvd8u74h25bsmb0h24a65i5j3/50356628633.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021052809081573499.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dfecb64dcb8---90150933925.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/1cql7pibft65c5928mqai1hsoj/70420562347.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/45410487334.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/146bab8cae0ba54327cfb9dc8fcf9747/rozevajejesotegewebutofer.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46e9646024---28964758898.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/lapusa.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f602be43a---lodararupojid.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/32744591479.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd243398cb---22676153411.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/fovenubusi.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/r02tpuvaqd6gf362jgt952g8cn/12411634874.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/29208654914.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/nudezet.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/92326258816.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/nudumoreniwoloxi.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/3785d70da231f9f32ca9359090b14d37/fofemewovukidipaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=here+comes+the+sun+king+tabPDF 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_off0000c566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 17360 bytes
SHA-256: 7945090d151ea7a41bc04cc8847071e5234af3f6b0640e692e8d2cf52545df20
font_02_sfnt_off00010b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 10956 bytes
SHA-256: d0df12da8bae21ee1249227e9a7e0cde64949b9f491e5beffdf1947b41677821

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