Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc236f93fcb6dc1…

MALICIOUS

PDF

90.0 KB Created: 2021-06-25 22:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f138851dabd7e0b3b966dce693d1fa28 SHA-1: 38560683ee2755ec45dc47b4245d85e63684c1ba SHA-256: bdc236f93fcb6dc12cbdc5bfbd7abba9d72117e6d54a2ef577f0c654334dff87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://irlanc.ru/uplcv?utm_term=golden+globes+game+of+thrones PDF link annotation
    • http://szpital-sulecin.pl/images/fckfiles/file/xasixelabelurobikobow.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/7ab107a4292482be7835ed3fabf3d5e9/givugewixebopitimobopil.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66f738f82f---nawuvuxawibelozir.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba4b81bc6d---tobonusikemimona.pdfIn PDF document text
    • https://geniodelweb.com/file/3236786276.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/rowafu.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4ca3848cf---wepopisu.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/bc089c554219a14b6ab7735452b785b9/4749458883.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae317cadec6---85428659655.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b59aead6472---kidiw.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/44875530801.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/jezoleboregiboju.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/noserakazibalenoxibasi.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609faf65819c4---54769285424.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/32011233159.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081de8ac0bbf---93626193701.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb957acca4---35648176312.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c70e6fa03dfe0db88c408f0215e20270/pamafunedozis.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/foxojozogiwetetutid.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c8829f76635---seluwelitutifutelevevafar.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095e76bc3c18---19513894274.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-23/20210623085956820574.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f7c29360389ab2deadd5dd67f3c37d7a/82017589588.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/wuxutozupif.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d24ff0476c9---nomodolik.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/4a81ec0ad914685d92eb5976b3be6637/nesuguniliv.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_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 10888 bytes
SHA-256: 4ce0bcfd04289b45ef637d01936fc5d0e2b3551e764db7d0850741c757ccc363
font_01_sfnt_off0001142e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142E 17728 bytes
SHA-256: a29fa308701a0b1ef225ac31aadefa3ee2e98b5fb28c9da79ff81947cd23615b
font_02_sfnt_off0001426c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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