Malicious PDF — malware analysis report

Static analysis result for SHA-256 2713589f241d2b88…

MALICIOUS

PDF

82.5 KB Created: 2021-08-09 03:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d5da18c6ecdee4262cd3ddfaea1e4cbb SHA-1: 1778c6f166a10afb868ff7ffd1d03b64d1c882de SHA-256: 2713589f241d2b886807014bc5cbbc908bfcd0d0597a555bfdeca4978c38dd0e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious actions. The heuristics indicate that the PDF acts as a link farm, directing users to multiple compromised websites, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=accu+chek+e+7+error+code PDF link annotation
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608119c5d2397---28541369045.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709ce4d07d7---zulikexunopujarogirufowik.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/92226764454.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083526c0edc9---45328999543.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/37502587961.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a6838701b---tekeg.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aaa8f9f334e---tazasesebagamadojew.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae60c0b8a62---97072729485.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/34493302043.pdfIn PDF document text
    • https://apizf.org/public/file/10961772982.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2107231105197815232s3g0k.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/83f79ec368c97c63a37e6e4d60198c22/gobamewutina.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/66448718721.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16102ec28c3b02---92585264843.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-30/20210530044400143397.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/d81344bde142d7492e576bb4a0c2b6a5/nulagonazaxuzidu.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/446378f3d2b7350771ce109c0a5c9c37/52585994442.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a497a93dd---34115378123.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/64519054317.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/3094655336.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2f0b970ff---89009341109.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_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 17396 bytes
SHA-256: e474f65a7074eba3209fc13f4437dbe8d1f485b2d6b2f69d55b7619655eeab99
font_01_sfnt_off00010ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EC 10020 bytes
SHA-256: c35f7f2a166d6055c6104caa2bf368aebf98c6bdef78ac3b5944581f68ef901f

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