Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e4f47d04134a2c…

MALICIOUS

PDF

86.1 KB Created: 2021-06-30 02:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a44133c7cc67f605312ffc1e93f419db SHA-1: b8de0f0d1219b10accb724559a6fa48e59181687 SHA-256: 15e4f47d04134a2c2cdebee35421528a165058999409add3f2e3524feaabc321
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised or disposable domains, designed to redirect users to other sites. ClamAV detected this as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. While no scripts were directly extracted, the nature of the link farm suggests an intent to phish or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/3nk2ceojnjvg7i5par7pbqkuvc/7834106326.pdf In PDF document text
    • http://artecgroupservices.com/imagenes/file/20037626092.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/54508936195.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/but99c3bs3lt3oc1raf93u0co5/14077466056.pdfIn PDF document text
    • https://signika.pl/Upload/file/6933078773.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/83983912326.pdfIn PDF document text
    • http://garderoba.sk/images/_file/kobewetamawinuxase.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/54694099526.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85ce87487---begupipe.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160850b90309e6---18336724783.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e47ef059b0---23853938980.pdfIn PDF document text
    • http://nktrading.qa/file/files/kumeligejuka.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16087694614fcc---sovadavilopevelosojesesaw.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b799990a9fe---lezejuloroparinar.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/susumuruzopi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/e5sej9d87sl98q3090lbhpuqru/70396939437.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/22075679111.pdfIn PDF document text
    • http://thaide.org/userfiles/file/21095928592.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/15837088244.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/26qd4kg5942hn2mv78iqrr4evt/53465692358.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/t3p4km4fvm8vhrqk3uo11ppuh7/dorofixodubafevovafe.pdfIn PDF document text
    • http://proxima-design.cz/files/file/wikebagarefoxuv.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/najimaseduzizaxeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=basics+of+biomedical+ultrasound+for+engineersPDF 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_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 11112 bytes
SHA-256: 04c24589a03217182b9dd7e797efd39f2dcc7133b59501b19f7fc0ea69fe95c6
font_02_sfnt_off00011c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C66 17560 bytes
SHA-256: 887db099791edaf7c158dbd0a67a7ebcf4eac43d49f89c43724358e36896cc93

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