Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41b6da092bef3f9…

MALICIOUS

PDF

74.0 KB Created: 2021-06-19 23:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bffa3e16bacb1b73342e73baf2dfeb03 SHA-1: 66aed2b09c0e01b202d49fda9d0a8bce450487b7 SHA-256: f41b6da092bef3f9699976062347163c9b8839aa477ba602a7d324b14f776b87
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of these links and the PDF's structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/pjf93pmku1se5jtrmbm8s64fk1/mudewafuj.pdf In PDF document text
    • http://chixue.com/uploadfile/file/20210520035707.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/729hev8657it9lie425fekbha1/kibibaxomuviwapiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2ec1a1418---61622512266.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/72649396550.pdfIn PDF document text
    • https://dineflon.com//files/repawuvuluniwudure.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/tadetidivim.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/figudomo.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/vatudovafogasuraxoxekas.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b506de968d5---45640678145.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608239f862172---balupof.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/vagukezanixazajesiwugevev.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/9412342640.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/642ec78071e05a3299962d0aa2a9654a/96945925134.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866f6c92691---17548562667.pdfIn PDF document text
    • http://promador.pl/userfiles/file/35340288276.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=bts+kalimba+sheet+musicPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EA 5196 bytes
SHA-256: 670da73b4fe25dce904e726187d72730c77196fd757592086fd912259a7fe46c
font_01_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 11064 bytes
SHA-256: d34489d65905c1b71fcd47b0e977cfd174fc7d3c9d62cbba65ecc925516969b4

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