Malicious PDF — malware analysis report

Static analysis result for SHA-256 757445c915795ae2…

MALICIOUS

PDF

93.7 KB Created: 2021-07-03 01:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 36b12b499ceb4e13d182b0332fc50619 SHA-1: 524582ad364fb462b8e4142297df64540fc0f8dd SHA-256: 757445c915795ae2afa60066c867d93cd78ad5df519ac3345e3b919d5ad90bfc
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious files. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The ClamAV detection confirms this file is recognized as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aulacvn.com/upload/fck/file/zoludojamosunadofovosoko.pdf In PDF document text
    • https://ksboutlet.com/file/files/kunir.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/ropinox.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/10107804284.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7eed569fa---84035088346.pdfIn PDF document text
    • http://snsi.jp/image/news_file/76054688867.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/dexakubusubabazedixip.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/rt0rbtepages7qkssj3g714qlj/14464381292.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160833c7e57352---domividasewuzebuvadilo.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5ebe42de8---lejekafukogabek.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160762ead48c9d---polonukolul.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/mizekutidesetemozusolup.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/nimuf.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/d86ebbbbda2e2b2e0b063f850eaec695/jimazevewazojakaridepi.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210513/file/43882118908.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9654b62df---80767309415.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/ae777bc4f05f19df1b97e34f522a21eb/26241544035.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/9cc98b397c32cee08698dcc6327b7570/33643941144.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/lisoraxabexuxezijulukowu.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/61257244453.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af1e093e739---21648439797.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/zeratuvutow.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef8f9efdc---71624865754.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/riregapo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a16314d6621---vifadadadiviviwifob.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/p8frhdqflo9a143j9l9hpl1g7q/kowajarivujanonib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=porter+cable+dovetail+jig+4212+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 11232 bytes
SHA-256: 56c7c986fb00f4bfc499b47e7f6b3acdf9dd93862296f7373cbcf585b2a3a28f
font_02_sfnt_off00012473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12473 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_03_sfnt_off00013a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A97 17032 bytes
SHA-256: 5290060dc6689669cd0d0b32396e7758e1ff2e04707f557a8670e640d9cda059

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