Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b50fcf0eb27187…

MALICIOUS

PDF

81.9 KB Created: 2021-08-31 10:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 201294b277201748c6c4b681052e1d62 SHA-1: 89449c01874cd360f0a41d7ad16919a85de65aab SHA-256: 11b50fcf0eb27187c6ff0a2d2a55e5672615111ea0b64d914ace846c9bedfb77
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Several heuristics point to the document acting as a link farm, with many URLs hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings reinforces this, indicating a pattern of using compromised infrastructure to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8151855047---35609358201.pdf In PDF document text
    • http://solartgaleria.hu/images/file/94884307872.pdfIn PDF document text
    • http://ipceurope.com/assets/file/dumaluvejutak.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/21011640786.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/34207909771.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/tabedesewubesogedosilonu.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfae08de350---24874854836.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/3989094931.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/kezulevogigaj.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/43550017207.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c999e48264---pumadiboli.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/80770412386.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e38b7c47fad---97124935481.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a10e5f669---65107973458.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/d0f1dabac39ac650855ffcd036e75e61/47128645359.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/b7b466c73dc42864773f0660da0329db/17179601928.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/en006ah8d5smdcpmc0df244ht0/73408517642.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1dfc8cd3---73635298547.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16070c5eeaf978---nimexa.pdfIn PDF document text
    • http://artospace.com/pics/file/kibupotafuvowonedipe.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/xarapelazasorovofedu.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/misimonurawibet.pdfIn PDF document text
    • http://furmanreunion2021.com/clients/3/37/3732e4fa3878e851f9d164dff32a9cbb/File/40574231143.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/vuseguxenunuzedaf.pdfIn PDF document text
    • http://strandedtattoo.net/file/tuwedomevek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=menstrual+meaning+in+englishPDF 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_off0000d755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 10528 bytes
SHA-256: 2166058f3b377bee7b3f02560c5b87798f8f241d9b55f45dd7225160e417e6f0
font_02_sfnt_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 19772 bytes
SHA-256: b1bf9d7ce5f2c38430d9c215886157e5eb19e401f59458c5becb77ba1d799a7b