Malicious PDF — malware analysis report

Static analysis result for SHA-256 f963702f7f4b7eb9…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 09:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2f854d2fea4e715b17f0fd30005aa151 SHA-1: 7aa2be83cfadfb9e0195a3f45fc0e6177e674539 SHA-256: f963702f7f4b7eb9bae7cd99392020c3e8ae0888270b70dd315fbd942925a9ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Several heuristics indicate the PDF is part of a link farm, pointing to compromised websites and potentially disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/1c427ab44435101dbc87cab7c0084adc/5069292642.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca69443c9e---gepijidadisaniges.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/bimirude.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/78506846519.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/82330647903.pdfIn PDF document text
    • http://akademibt.com/resimler/files/remiroxelubitijodedilibo.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/gabijipevozeb.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/xometo.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/kujixujabesameros.pdfIn PDF document text
    • http://yjccnc.com/upload/files/navir.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/62056903150.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/62627895217.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/pimanixitamisexoza.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/33227415753.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/63658157816.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/kagelo.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109112347213778.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a55828468b7ec3483557cdfc1e95ce5d/11529232823.pdfIn PDF document text
    • http://dlzj.net/upload/files/2021092406250857816.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/44859021020.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/levulolunapaxofozoku.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/5668b80e4f3a95f0317bff548dc14a69/nanuzumoxuserutijelufe.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/16705796139.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/lofedovegisepulanag.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/95424758593.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/74472551679.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/bapepile.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613880d4b8264---51067300913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=principles+of+quantum+mechanics+ramamurti+shankar+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_off0000b48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9F 16008 bytes
SHA-256: 1ca6b64f819de0b265dac7e233b5eb395eb86ac5ded926d5e5bcac64820ce15e
font_02_sfnt_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 11224 bytes
SHA-256: 9007ed395ca7bcd2c726d2f72b0eaf2486b9b7db4d25bccb5535be666267b983

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