Malicious PDF — malware analysis report

Static analysis result for SHA-256 8698aaee507f2c6f…

MALICIOUS

PDF

69.6 KB Created: 2021-09-11 17:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: da41dbbeb53210ce2065b1468aef53a0 SHA-1: a41ee6e7473f4943e90136f6d4bae2e0e0369d2c SHA-256: 8698aaee507f2c6f3e3e507ee8205a7d62f773620b2c774c6e282fc9b6b29de3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/bedojusu.pdf In PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161334e48b7a26---xitofesuwamesugazefiwof.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613c14fd38894---63742797136.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/sedotisadarakizurobe.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/p86g9fsrh22r9u25o2f2knspr9/55881646543.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/buwafifanukoz.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jc3vm9nscb7aqj6ol8bsdds4h9/mepiwevosikorugibezu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c3147e449---14065991171.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/subegi.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/13786974094.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/nezixexefutude.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109111247348377.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139610138855---18085767818.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/duxufutuxu.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399af29e6c5---lugitibasowujasegakug.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/vinefokotunikevedobu.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/vopalu.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/8812615912.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbafcde063---xafomowol.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/93373505569.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/lovob.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161397097933c8---9839579356.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c7efae31e---65176847565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=a+zee+quantum+field+theory+pdfPDF 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_off0000b2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E0 10996 bytes
SHA-256: e12ba936f656301e6e4bb70ccbd380078c3ffa62cad5d0d63eeaa4f76c76cde0
font_01_sfnt_off0000cbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFF 14880 bytes
SHA-256: e25bcad934e81039ff21f1b248e9fc56defbdb493056da1725645491e91edc81
font_02_sfnt_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1