Malicious PDF — malware analysis report

Static analysis result for SHA-256 26072f7d72f5971e…

MALICIOUS

PDF

95.8 KB Created: 2021-06-30 12:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: df18d2b03b02e68df5528d213028be63 SHA-1: d701116658ea89fb297897d176a0f55ffbe523a7 SHA-256: 26072f7d72f5971ef99fc9c105767f08b01b2473eb096af46c45dc2406b4d9c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites hosting PDF files. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/vdabe96s83203c15ifr3il2ou7/javobiden.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ob1hnma8hqto6rom7ek278e3n2/22504675429.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/a1s1sham90r3utgl0g1ks95fmj/13127454051.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/p3j1i9rpm54qc2eogmfok42p0v/buwafubogakekevubowe.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d1c42d5c7---birefuvalaxejefob.pdfIn PDF document text
    • http://anpo.vn/upload/files/21975202043.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/mapoxa.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/17227861367.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d19579eb5e6---xoxopelapunagedovugaxeza.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/nhsa77beucgejith1ne1mg2sqj/70316681149.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210614203714.pdfIn PDF document text
    • http://szwygs.com/upload/68648874617.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e1b9648e9---56604458073.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/judokif.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/38770004889.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/danumawise.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/27139668176.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210624/file/16245689759971.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/psbohpgp67agnmnk7v5ki4di2k/24659467674.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b762f63151b---jibolanalalilowuju.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/198513185.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9cdf84256---42210379606.pdfIn PDF document text
    • http://merwepizza.com/upload/file/11807534336.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/26079468979.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/latagosatumokejenugezud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+beauty+queen+of+leenane+free+pdfPDF 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_off000112c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 17776 bytes
SHA-256: 0833bc5ae761b195522c3cfeb627953fb849c79399beca245d6f359d45ad9971
font_01_sfnt_off00014145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14145 10800 bytes
SHA-256: e52565845020574a6eab9e175976ecdb0fe38055e9d469a72f3aa3a4e736582e
font_02_sfnt_off000159ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1