Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a1092bfd5ce8b0…

MALICIOUS

PDF

87.4 KB Created: 2021-06-27 07:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: adc850398fa029fb2531549bf63d0ff3 SHA-1: a0796ec6033a6f6da6982ef0633f4cbde5b6d28f SHA-256: 47a1092bfd5ce8b06128baf38f89b9ab72934c7cbec5c023b644453a8031e204
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm that points to multiple PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV heuristic strongly indicate maliciousness, specifically phishing. While no scripts were directly extracted, the nature of the links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/2890740cb6ffa4f9f9e49373ad47b97d/pikuvido.pdf In PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db5fe9786e---82430899022.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cedbe5f171---kuravufanazozamuvijewezam.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/658eb7d72e81e7cacfd5bb87646c3811/vigodimekokuxozotufuzu.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/096779f9ef2059620719f7749b57417a/wupadebimopili.pdfIn PDF document text
    • http://usmleworkout.com/files/file/27703524032.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0332678bd---gewik.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1cd8788c12fe53d5e6db9ac0790705be/93178449867.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160719fca42359---28570626229.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/fosilunodes.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd14bb262---felatojolusuzafusuki.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160855c5ba33ac---83215697153.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca2e72238b---kixutex.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160725485a6303---52962640245.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/47740738818.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/63398536593.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/wumunopupemedakabusodive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=things+a+2+month+old+should+be+doingPDF 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_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10827 10920 bytes
SHA-256: a88ca65f42561ec27350d118dbd0d722e24feb1d692ae84a19cb7936f7c8b34a
font_02_sfnt_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 18160 bytes
SHA-256: e3756a10903d58dd3864c048d194d9bdefa0c68c2a7ac008ef5c220b320d4725