Malicious PDF — malware analysis report

Static analysis result for SHA-256 da57644460d3fc19…

MALICIOUS

PDF

72.6 KB Created: 2021-09-07 22:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10f340e94d535caebeaa75788c63dfcc SHA-1: 12d36db44b3c42fbb6901707a47bf7c592116342 SHA-256: da57644460d3fc1971d48b0ddcc70ebe274322f63689a9c65be8496a46d2921b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are compromised CMS upload locations. The primary purpose appears to be redirecting users to potentially malicious content, as evidenced by the presence of other PDFs hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/rafakizixuvepixuwujuxej.pdf In PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/56032108921.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/lerugobifajalexilebod.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608a58335912f---rabudusuv.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d428b7982---nawedifogugusifafi.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/54243f38da8ed7fd26e41782de5e62da/suxikuzufepudalofe.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/19681383556.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021070275926_837605258.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/91596863272.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/24262681257.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/jalovetar.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/nudafasodabufivaburin.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d25227ba56---45841974513.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794e3d5743f---10876246932.pdfIn PDF document text
    • http://orlickachata.cz/files/files/guvakalokowumukekogek.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/2e213d3021e1a75ac75cad8a81d5dc3b/96555433870.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/waxoveguz.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/bijaluxifat.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/43679c8733f79291a38b8b97d09e4c04/safifuragijivorinuwudopi.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/35243091921.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4141bb34---jinenogusup.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/6q5l2vh0ofilh52im03drlejdk/gunokam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tissues+in+the+body+worksheetPDF 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_off0000bb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0D 16008 bytes
SHA-256: ab27cf927c0165fa3a4c7fe281e1069843884f0b8779a9a6e1f66cc9a5a16666
font_01_sfnt_off0000e454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE454 10632 bytes
SHA-256: 491cd4f1190010ee5786415af5ca4e727056eb9a3ff84ea2e1ce19c6db9c6850
font_02_sfnt_off0000fcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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