Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a944b7519865524…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 19:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 226f0bce8a3231b253365a25e96139ec SHA-1: 3c23fa465c1cc3e94f263475c158a05104d3d55c SHA-256: 6a944b751986552480efaf8333a3be1732f85ab70b7101cd047f17aa8cdffad6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no document body text was readable, the presence of numerous external URLs strongly supports the attack pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f49e000b2f---10965105762.pdf In PDF document text
    • https://fptica.ru/images/file/rosof.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/gajuxixo.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/87196181629.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/48065098703.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/154415804060be66d2900cc.pdfIn PDF document text
    • http://capital96.com/userfiles/file/zujetowobepomezojuleju.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081aa4e015cb---15260113372.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/91461509959.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9291ece2f---jezixofab.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/77021763649.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/83741595568.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/zekinizesid.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fc05d8d0c78---gogumoripikutokedimi.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8027a9707---53196339338.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/95090652531.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/loxonowex.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071e4e05a94e---4242629060.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/bubizakuzo.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/godolidex.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/47672656433.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/39203044316.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/5b45e7746687db5130750ad07d10109a/kowonobitubigezedopilu.pdfIn PDF document text
    • https://cncunse.com/d/files/83897269564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=interruptor+termomagnetico+schneider+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_off0000c89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89B 21096 bytes
SHA-256: dd567f2b1ee032a935ca22b259a5f2e42a3ffba8444eb531b2b9596efc998081
font_01_sfnt_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 11072 bytes
SHA-256: 97bda37cb4c725e5fd75a051f01907f20fb2e4ba08be9d62b852c09bf6f2b006
font_02_sfnt_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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