Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c93b3337bdf9cd…

MALICIOUS

PDF

87.2 KB Created: 2021-09-10 04:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5bd8dc70f6434deb52518778763eae22 SHA-1: 0327c39121f497a8abd928949606c8ae3e39d2d9 SHA-256: d3c93b3337bdf9cda0db65fb86092f5eccc5b852aab7bb255c5719f93248108a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://ags-sib.ru/ckfinder/userfiles/files/kilezuxerof.pdf In PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/nuvigotufixowu.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/doxojolojiwowevawiza.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/12274606537.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/23029661850.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161369cb99570e---56432556254.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/34086176541.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/kijoguze.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210908124643584.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/bexojokamuti.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/25156998702.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631233679.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/22307792498.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8e06fc27a960609fbacc85eb79bece23/24900342348.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe1387ae48---bufutepugixixujomegodav.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/ropepavewasifonudiv.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/29049672899.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/dafulawegomakufawo.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/ralegisojosibadula.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/megeposibokik.pdfIn PDF document text
    • http://envigest.cz/upload/file/dejudolowusajurilibu.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/76723608502.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210901201108.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/93260911461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=best+racing+games+android+2021PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46C 11016 bytes
SHA-256: 65c5aa5d222272a0c144ac7b4fa49a994f6da4ff79eee56d4e3f4f425f120c58
font_01_sfnt_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 17012 bytes
SHA-256: 029aff1955266f78d033a48f87d57de7b18a6c6c4f9cadc1aa600d4730511dcd
font_02_sfnt_off000119e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E3 18296 bytes
SHA-256: 7f59bb5ba03773a417cb8d14663b133d04971609031e632cafe5d7f4d8cb27fd
font_03_sfnt_off000136e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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