Malicious PDF — malware analysis report

Static analysis result for SHA-256 56efc45dfb3e5bab…

MALICIOUS

PDF

92.1 KB Created: 2021-07-19 09:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4476e564a19b9cfa37a28ddecf0d78bc SHA-1: 30d5d9cf3dfcc44f1ec3855cd8a8bf8f4a50000e SHA-256: 56efc45dfb3e5bab41f8f5ed5e5b555a13a3a19e5f48bbe572929ea93b26faa8
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites, including those using WordPress upload vulnerabilities. The PDF's structure and embedded links suggest it's a lure to a potentially malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/7a375f6c3fb003b37d2499bbd0e37e4a/bufekuf.pdf In PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/4810702620.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/soseluwufezajabirekidona.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8778592a2---nolumevizemafada.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210519091758916.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/e7abc828d5fc01cb8aa5b5811bc11742/90965205065.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/bomapinijubiwujotib.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/67648220700.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b533f1443---91750033716.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/gevotufow.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/85810172372.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/nalivemowigelijam.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/8edcdc8022eaf4928434c1be279d0501/punokivubirefeno.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/fusamalowumefidulu.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160857ea164f01---kumoxivaxav.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc1d237c8a---88787667514.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/32962650511fdeb50c7ef9575d0c65da/42438703343.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/22ed9ab5da26c6c4aa58b260498a359f/vojofefebipo.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/10508259088.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160addec23dd26---54158071118.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ee88e07966547a52f1533823df86e958/zafukeriv.pdfIn PDF document text
    • https://carlojans.com/cms/file/xupoduligegegejinajure.pdfIn PDF document text
    • http://paliukenas.lt/i/File/7067562760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ben+and+cristine+simply+nailogicalPDF 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_off0000eb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10316 18096 bytes
SHA-256: 18b849af64c244674a084cd7543e067a375bc24424e412c5d53aef966a822a7e
font_02_sfnt_off000132ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CA 16368 bytes
SHA-256: 1957c7158e46d2a1fcea66bafa400ac9ebca94e16e515df6fcf3dbaa0e857b8b
font_03_sfnt_off00014922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14922 11024 bytes
SHA-256: da9228831aa16c1b3c45785c15a35a8ccf49bd534e7cd7b76e46b111fe27378b

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