Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a2a6b4ade3508a…

MALICIOUS

PDF

78.2 KB Created: 2021-09-22 12:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32586c1ecc58c9bda776d923d336232f SHA-1: 9425fc1c60fb9ff892e0b64f9e20540e0e5fc8c2 SHA-256: d9a2a6b4ade3508af503f306ede871cca6d97e5320f13245f524e53e495a6da3
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and URL findings suggest a phishing or malware distribution attempt.

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 https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161427fcf70b13---baruxixuzepusaw.pdf In PDF document text
    • https://themalc.org/files/file/waminuj.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a108f669c6---gasufosujutixilabor.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136339635473---82957969326.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/podefazorogupoli.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f640d0beba---83867323339.pdfIn PDF document text
    • http://scpt.it/userfiles/files/xodukolozisurupi.pdfIn PDF document text
    • https://jurad.eu/files/file/tetotetozotebaki.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/52156170715.pdfIn PDF document text
    • http://otczenacts.com/media/files/muxuwojepak.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/71105b7811a25929d140ecafe36f22b4/fowuwiloxori.pdfIn PDF document text
    • https://edgecs.com/documents/rutaju.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/dinamit.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/49832802522.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/16267095874.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/69392153621.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/sevuxedilis.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/xabamokujuteviloguvi.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/nawikudimebipu.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hjlsv9j3q6jraiufafs04e7pd1/wovawozitipatosa.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/xokaropanepimen.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8a84d488---12727163587.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/7748258525.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109120726458553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mayweather+logan+paul+free+onlinePDF 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_off0000ca9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 18372 bytes
SHA-256: bd190f4681a7fcd60d932bdf3ad379cfa68f7ccdcc9dfe3159ca1f3009eb381f
font_02_sfnt_off00011298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 10764 bytes
SHA-256: c020b81c302feff42fdd318443433789ff62001daf20ae471e04fe64bd049009

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