Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c6db47ce73f51c…

MALICIOUS

PDF

79.8 KB Created: 2021-09-15 00:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e815e232c1b3a7c7f175dc7bf4e37750 SHA-1: a2586c48b9e0b6de8f69936cac1b7753634a2ae5 SHA-256: c7c6db47ce73f51c103303ee7cfabc03bb239675fedb2bbdeba292a594cb42c2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple distinct hosts, many of which are compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The presence of numerous PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://meubelenindex.nl/images/uploads/25243758446.pdf In PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/binatixu.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/minubobezuxiwijexemotutub.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/lovukogifazubuvurero.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/3e0cuf2lttr886dpcndl83vco2/87655445125.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/nemeximiwopokor.pdfIn PDF document text
    • http://opsir.eu/files/file/gixagib.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/saxipigepasezenijafu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/52180586325.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/rewuzir.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/11970460636.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afbe0b4543---zilutepewog.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/48769124020.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/52037294473.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/5151174548.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411494845e9---mazifanasilem.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/4tn7ua7ekoql5a0qe7caefc5f5/49866802024.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/dumobabusimuwirexif.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/28801686008.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161367ff29f097---57088503725.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/turirazafepigizorevive.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/bavejibatabamaborinif.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/33896493997.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/muvolebobugisaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gta+sa+cleo+mod+androidPDF 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_off0000d2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 10568 bytes
SHA-256: 097783c1f21b5a1c7f5b729ecaf7250cc14115e8fc48c1221d42c4a979d18cc8
font_02_sfnt_off000102ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 18216 bytes
SHA-256: f1c12bf019b4a7d514d0fb6ac6ba0a821b428c6f1f7112d531fca4fc62c5bd20

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