Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba43265814d7e5e…

MALICIOUS

PDF

85.2 KB Created: 2021-07-19 06:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52cf8c9ff5b69ce54f7edfc51bb151e6 SHA-1: d869c50f33eaa453eb82acaf17b205e09d55855c SHA-256: eba43265814d7e5ed771c15403fd4441912ec34b28c78c7550186e740c246d31
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised websites, likely for phishing or malware distribution. The presence of numerous unknown URLs associated with compromised CMS uploads supports this assessment.

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 https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079edfa9b5b1---wolowipenoxagosexa.pdf In PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/39739292571.pdfIn PDF document text
    • https://kristinanamaste.eu/files/biviwarew.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/gpi29ee9j6m6a2j2mpo8fbpvje/21557059219.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1a00c462d---naluvutesov.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/3421963525.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/10413216675.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c36c9277bd4---bobikaguxam.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/10b03966b67808eb11580aacd759c407/33187778490.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/wavotekokabanejudosani.pdfIn PDF document text
    • http://strandedtattoo.net/file/77446008806.pdfIn PDF document text
    • http://allycatering.com/userfiles/sazikizesewifo.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/83522674859.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e6d5b1c68---95442879371.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/kofibunujobisexuwuki.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ead169383b---karexupanowarepef.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9c651e146---giwodikamegelib.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/kaguzaxixitereb.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098af627c6e3---72567854483.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/4bl3upqt6ai2rc81r61f8koffu/kifigajonavurij.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/bupobas.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec9971e951---48942227072.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b82458cdec---letokuzolarezukeda.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/mikusululazudobekerikimos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=20+dollars+in+colonesPDF 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_off0000ec1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 10412 bytes
SHA-256: 002bc9e6abbb5c9f4255a3673d7886be85dfee0139d068eb65ba1126884aa0dc
font_02_sfnt_off00011bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDA 16752 bytes
SHA-256: c5049e470a1c73b63102fc802e9b5fee636d95253534d0c66f4ead9ba6e2cb57

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