Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec72696b47217c26…

MALICIOUS

PDF

95.1 KB Created: 2021-09-21 18:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4fb5a41b7f7ffc2cc02283d7d227483e SHA-1: 4d1f0c8c3c32224348e683657292e28412df6819 SHA-256: ec72696b47217c2677a840bc4b4bedeee47907c2f8f87a94e9f5f4014d0602f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://pistant.ru/uplcv?utm_term=plants+vs+zombies+hd+apk PDF link annotation
    • http://massimosusto.eu/userfiles/files/sumopoxisesifigadewajeg.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/92156962203.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a47b527c46912693c6b9ab64e85c76d2/23589527132.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210909133257901365cwm20c.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/gonepuxusesedoge.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/88643236396.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/pozegefu.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/19/19715624320.pdfIn PDF document text
    • http://adfaveo.com/image/files/20210915_211024.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/num84u631mnle2lapr4e5sq0e7/93371433004.pdfIn PDF document text
    • http://dptech.vn/uploads/files/35966178758.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b49360ef06---91195335519.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/fobagozonedebasog.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/78718889878.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/11776503771.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/timudujezeki.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/nirewaxirobukegexeranip.pdfIn PDF document text
    • http://cellfruits.com/ckfinder/userfiles/files/rugojisuwuzizazu.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a82d04c362---71044225020.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210911180850.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/dipekisugexizipagav.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/fiwukel.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/56879616594.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/sewidepumojapanasepuw.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/47015522337.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/40192408205.pdfIn PDF document text
    • 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_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 10916 bytes
SHA-256: b9f13494f9816dcafba27c565d716c145745f59a5d95950ef31206fd08499d45
font_01_sfnt_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 24208 bytes
SHA-256: ea9baa68fbbe525764a4ddfc7f18641d2199aa0db877ba9b27d3c1ccbb5ca499
font_02_sfnt_off000156a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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