Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99e1fedf80d35a3…

MALICIOUS

PDF

83.0 KB Created: 2021-08-25 23:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 28c44aa4166c96de275fc4c8e3e5a9c7 SHA-1: e3c40a98b8ad73d7b8e37d8f00cae7204071e1a1 SHA-256: f99e1fedf80d35a308971d06c76b9738a08557fe0ff625eacff96c2217241165
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/5268a3a38fbcdec6908e9f2a4f8cde4a/98750437106.pdf In PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070de8de2927---93901157950.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/kapaxuzenuwab.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/33c47d055904ab263c06bc8da00e1253/99988434273.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609832891470a---9798383258.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/tufabomepukisififawiwan.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/86063648304.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/46771193879.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e69a1ef9b---jilewaradumono.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/22078964442.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/12410066243.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dffdff0fae6---tifixogamofi.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/jejobitudote.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/834064300.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/9au9k7e7av2po7fjctddkrlhdj/gobuze.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/koxikatumabarokowal.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/225b723f96afc47700e262158b4fdce3/xavap.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/1415a7c071781b1b7f813ea3d4fd4875/luzawusazutiduralivabu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/83edc65bd70a4d09f53aa2c33fa4a570/furonamabidalegib.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e00402a26c---sutawemul.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/25535753895.pdfIn PDF document text
    • https://mattress-leader.com/media/deputawizesukaj.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/dazixepajaz.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118a8f896555---bufage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=inviolability+of+private+property+meaningPDF 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_off0000d6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C2 20972 bytes
SHA-256: ba1ee8c31cdf520b40ae530a37d0e758454dd08816dadc6faddaefea8a0f6c66
font_01_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 10804 bytes
SHA-256: e9b97734b8f576944d973e8822d1bc9663a078a2ae506d20e1eb8cbaecb87c46
font_02_sfnt_off00012424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1