Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8dd362072f0f49…

MALICIOUS

PDF

86.4 KB Created: 2021-08-18 18:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c5d2b782206c1bdf8a7a6a80ee4043a SHA-1: 3b8e0a659312be219e213cea839bb159d322f2af SHA-256: 5a8dd362072f0f49a1e762cd4b16c1e27541680b7427c7115f13c9ecbb01e926
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://krisoc.ru/uplcv?utm_term=auto+train+lorton+va+directions PDF link annotation
    • https://a2designbg.com/userfiles/file/61448082294.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210505231058497554gma0z4.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/rolorosivososegowur.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a8d5c2b0f---56234236593.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/vikozapifikibuteporafoxas.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/6bd951ce134a83c54b27e3c68606c92c/xomadorofewuzadojamefu.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/6cravam1g2nd3mliusc71a720g/65792959749.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/dajozaxanogixebavugexedik.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/balogijubuxolufodazu.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/xoverewisaketesozixulin.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5899399a01---46897959387.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba0b6000b3---85192309882.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/512628822.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8ab44cd860fd3e282412eda3dd376749/2881984295.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/36240422092.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/mibumeloxorafi.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1623266800.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/fugagifofetori.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3aadc4f8920cc7f8d793192ff66bd971/78285046006.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/i439pk5aqsg03o7l1kckmmo1c1/kulikaxikapuvotesox.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab037907a---84321275848.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8aa2dba25---wutetaboku.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/ginosasezevarurajamape.pdfIn PDF document text
    • 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_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 16776 bytes
SHA-256: 423d71c8b5608948f8df727504621f555708b162caf86a154e80fc910b591c0c
font_01_sfnt_off00011be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 10512 bytes
SHA-256: 4914269bc7c0d3284e0319d071518bc1fd36882991df0a8e0b0f46373513e70d
font_02_sfnt_off000133fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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