Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdbdad0f32882bf…

MALICIOUS

PDF

97.1 KB Created: 2021-07-22 11:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 109a6009528ae573e4eec141a2a69a05 SHA-1: acfc03cb20429e7fbcd50c7c8525452d140873f0 SHA-256: acdbdad0f32882bf1da8c595a44ed9c2afb07d60b17b40b2b128acb3063e9172
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and potentially disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive or infect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/bb0b00bcd81f29037ceabf4a8dd22a8c/45842455718.pdf In PDF document text
    • http://auxerretv.com/content/public/file/86064401759.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tpr9arvo1h2ficg978d23l68gc/pafelokapoguledanidov.pdfIn PDF document text
    • http://slsnn.ru/content/file/77879777705.pdfIn PDF document text
    • http://ccsl.asia/files/laluw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c5a28a7e1---60875538064.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/wivowetisogarolaxeruve.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/dupafaxovovajomat.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021042908193611.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/wixefanusobizipunukipe.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/40158354807.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607217b58b396---79701685101.pdfIn PDF document text
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/bipenor.pdfIn PDF document text
    • http://greenld.com/userfiles/63785070149.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50841309566.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d500878d1---buzaru.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8b3bde7ca---danimulowupudir.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d3f98f0157a043ccc3f06cb5d1cc56f9/suzezolor.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/dejedoneturidobifikosuxif.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/84332784491.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/45083236102.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acecb4cf930---putotixobipuvulotugine.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210714_7082598EEC3B24D2.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97d3a1a5bd---17731947640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=most+urbanised+city+in+the+worldPDF 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_off0001166c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 10900 bytes
SHA-256: f785d627a272107007eaacd5d0f9f736ac316405a4cf61d622c5c433483fb27f
font_01_sfnt_off00012fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C4 17724 bytes
SHA-256: c66677fea10f640f471523066640ff71c52ce088d98e5ee38cf620c35a2b350e