Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c75c1da3a5aa95…

MALICIOUS

PDF

84.5 KB Created: 2021-08-04 12:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b6478aba1c4ca12a48376c259c841b8 SHA-1: 332e3194512b7a844727762c3345f42aa6e5b1fe SHA-256: 11c75c1da3a5aa959b7b471e7079f0dcc5b66249ec9b4330221a6ca2dd26fbf8
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The presence of a 'download' button lure further suggests an attempt to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bmcnx.com/userfiles/file/70016535427.pdf In PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/4lo1qhj0pamr3gtir5g8aebf61/variba.pdfIn PDF document text
    • http://skupka23.ru/upload/m/81455143506.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160edb5fa7d997---dovugujativeb.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/t4e9r6ub78548159hqpdsgjfnd/63326426203.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/pegixazupodevedabekuzo.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/20521015115.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/zesumokeninedutizigalono.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/d855g6ma4agvdl4mg05if95l4h/47866118004.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9u6uqv4j4oslhqnh5bd49mg8j8/37207278065.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/52145001601.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606defbece24f---tejitufexeten.pdfIn PDF document text
    • http://mesterek.net/tmp/15661926703.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607effda0a6cf---bokegido.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd337f5cde4---87788733992.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/lurelabimafulan.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/91194334130.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160775f7a128b2---11286726291.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/nipezuduvanepogovifotoxi.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/688779061.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/pakuwafifukokijopatufupe.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/2779683303.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/37189246626.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210630_df642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=free+articulated+paper+doll+templatesPDF 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_off0000e76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 10648 bytes
SHA-256: b197cec6aee77289c5b7a832ff91fdcf7a75ffdd637369ad007323a7e2f70a4c
font_01_sfnt_off0000ffcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCC 16904 bytes
SHA-256: 3634e6ef1c67930f10f41122a45327ef6facd05c0518efbf49a80d50d2e12aa4
font_02_sfnt_off00012bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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