Malicious PDF — malware analysis report

Static analysis result for SHA-256 e456fc15dfc319b1…

MALICIOUS

PDF

93.2 KB Created: 2021-08-11 04:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a397dd3a87ce12ef6293ad0b781d1dae SHA-1: 5e5f9ddae8260847172dea5db384c8a8bd04351a SHA-256: e456fc15dfc319b1203de1b931314b72e5342d092db8a684be4bebc61ac03a46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a large number of links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to obscure the true destination of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://alamansyria.com/userfiles/file/32882939624.pdf In PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/14958891409.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa83e299bd---41812391004.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/90010793525.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/7ucvn9f40kenlb6mcaf0n7iieb/29102755114.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/77586535551.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/rufutixosenopiva.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/886d592052350135ddf6be0a336f9f8b/29129667024.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/81948570111.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/retufomunetakuxowowel.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160e25b84b13c9---zukedawewe.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e63ed10566---44084997976.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16094adf43021e---16380411050.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/89711282740.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/sasorovux.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/lusiwoxabigozima.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/vajunaximurikasadiluka.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/20725632785.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/06/22/66904848999.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/89227547287.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ac13cca39---zisakamimak.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51aa73468---kejalesujusulere.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74eb99204---ruwigukaxexi.pdfIn PDF document text
    • https://cristalensi.com/public/File/witufipukejelewomivuwa.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ul593rc2tu6bnpisgltockghh9/gawigizogaliwuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=p90x+free+download+full+versionPDF 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_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 17576 bytes
SHA-256: 93eefe94761e8bcfa548e3c7a40bcce8ccf86c45e7893f0b47d763f4581eee76
font_01_sfnt_off00011d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D65 10892 bytes
SHA-256: dd640dfa89fb13d7c4b8b2618f725e091c087a656103146b4edd83a054ddcb9e
font_02_sfnt_off000136d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D2 16292 bytes
SHA-256: 4888672facc17feaf18ae04d5451cff7c46d4f10b744c67f2be479ed27e0674a
font_03_sfnt_off00014d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1