Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b29e95b170bd76…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 07:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 83a523b5a351036d97e0f53ddd402c55 SHA-1: bfc411566732e647c140526deb42b0fe27b9fd7e SHA-256: 81b29e95b170bd76c02d2a255e2bebc2b103aa4d0bb89a3e7911d950d10ce957
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb55412f106---84338988890.pdf In PDF document text
    • https://108pizza.pl/uploads/userfiles/files/64378441935.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/suredugod.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///detutidofusij.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/37415081607.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20309385851.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/qub9orv3c6k3l25bv2j6ptc2q7/77258582727.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/4801192798.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec4053fdfd---zomubasibo.pdfIn PDF document text
    • https://clove7.com/userfiles/file/35541883982.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/0a35aa2d04c6ec3c3d0e272d2526fa6e/48417362740.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/zajezotokov.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/75066380496.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/65f2bbfe34cc66068f0fff51a8a50634/tutibetila.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/1c5968ec02008a2f48707b8834bcd1fb/78387464540.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/35664384456.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c14cfb1c131---32383678881.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/78665101628.pdfIn PDF document text
    • http://hotstamping.pl/files/file/38027277546.pdfIn PDF document text
    • http://askort.pl/Upload/file/83036579263.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/23391575738.pdfIn PDF document text
    • http://ebus.cn/up_file/file/pividetumagilapok.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/1482f20bc458deba86cf25d33631eb60/62039923602.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/71056985690.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd7f4a6a85---88615802809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=basic+communication+skills+worksheetsPDF 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_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 10828 bytes
SHA-256: 27aedc3beef8762a99fae476eed1dbbca7a1b25b9543d73ad0d75ad73ed4328d
font_01_sfnt_off000104b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 17608 bytes
SHA-256: 3db9876d7acb73ddd0d0edded3f59552f7f378005ba11551cb30e8e11cc9b1ba
font_02_sfnt_off00013189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1