Malicious PDF — malware analysis report

Static analysis result for SHA-256 248b087fa696acca…

MALICIOUS

PDF

86.6 KB Created: 2021-06-26 16:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d8205c8a47b16e6dabf92dc569bef162 SHA-1: 14b32257455cd5ed1af966ebb51649a2547e525b SHA-256: 248b087fa696acca06f129d7c6d0fa32aff4b2d3a111fd833fd2bf713d22605c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to websites hosted on compromised CMS platforms or utilize UTM parameters indicative of link farms. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or directing users to malicious content. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799f3c2575e---2742938907.pdf In PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16073965184cb5---libobituluworegarujekoxog.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/11051586343.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/oudo48d43m4qjbuq2kbk0rdtp8/xurelexogejas.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/29589507534.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6a1f2b6fa---68022104525.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/bebuludepegidiz.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/uojq8gbogcjrcnfi9f1132skf6/perazetoribajavovutamulu.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/75946760440.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/41upqsvevtac33pbkds1agoidk/mibumegurot.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/18489573449.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/f654a02db84dcf362b75ae8b334ff6e3/lufan.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210528045004.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/30049317773.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/posibawapuxazono.pdfIn PDF document text
    • http://pronobile.de/catalog/file/soposafelasaxafutuzuwut.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/zimufojumiv.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/1c1339a46ab51fc63a53175182994bc9/26462719865.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/eee8f804ae4c8d0c86c7c221b1059743/rudekuvavigimumiwidela.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a68ab9dde28---20765201150.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96e60a55af---46245907191.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/3885290439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=learn+english+in+30+days+book+free+download+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/sapomokun.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_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 11364 bytes
SHA-256: bd177c94958e48e41c8c5d65099e2e15524e697a0ed908d859b6ad903f1ccc8a
font_01_sfnt_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12023 17124 bytes
SHA-256: 88a2ac4b429282795186c21777663defbcf19866408b37f4b89687ecff7653bb