Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6626d8480b824b…

MALICIOUS

PDF

72.3 KB Created: 2021-09-28 08:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 395c5b02265f54f8db9c78b8346939af SHA-1: 0686f58cf173bcbed37546544e714c929e8128ab SHA-256: ac6626d8480b824bd0f8f691d3054f95cb4f47d072f6f4214c8107840463ff18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for malicious PDFs. Heuristics indicate it functions as a link farm, pointing to multiple external URLs, some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nsdadventist.org/FCKData/file/57843845807.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615048bfe641f---63608099319.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615289af08e51---17206112652.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e9b76db450ea86e634aec03e2d0e6d8f/52738086866.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/biduvegatumofijenus.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea4a76ae1b---renagilokowinorujipob.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/sorafivogatakun.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/5883ca137aab520fc800dde15f0bfe76/87693285540.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210909233316.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/fovaniwimafakiran.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/53875045359.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/20815488964.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/45079665458.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161438ba894557---38804911222.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/vevikabatopotolavomirome.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/vugovug.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/jilusuposi.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0bcc78ddfddeb265c46127831b6a750f/kiwivogaxavodizuxuka.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/niwudufuzimizera.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16151a06f1f130---kofolisisavojeremoju.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/75715420898.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/jupigomoxoxage.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161393b0066e82---11096066487.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/73582504580.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/darebulazife.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ro05o3so4vaicsrnhvg5cmft1c/39336476486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+change+voice+on+text+to+speechPDF 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_off0000b7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AE 10752 bytes
SHA-256: 6ce94c8979829a55eed4a2db2e97c331502de74e9ff8a8d7ef5b551e01b361ae
font_01_sfnt_off0000d071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD071 17408 bytes
SHA-256: 9e66d6bf36d9a77743e57e2729b6a7bdf757a0ffed7874b7358f353693bd0f7f
font_02_sfnt_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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