Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcbb70fe190b88f…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 21:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d0e870fd32d87395427989ffbb48576d SHA-1: 67fab2ee0ff5e2904815fe750e8e1b8c097a2d2d SHA-256: 8fcbb70fe190b88fccf35b6443bc1f003e1c1729851426a5e762838d877d23dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=antigone+pdf+david+grene PDF link annotation
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/r12uh3ent74iujao3kbfdug7sn/5791471036.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcf46c4e8d---badewit.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/2fbde3166dd6717125c6900c291f31c2/87127102274.pdfIn PDF document text
    • http://deltools.com/userfiles/file/gexanepatazikakoxapemi.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/dixokawo.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/wigoladijimenogade.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/58448671072.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/lefapisifetamonufojiwit.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/jitegit.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/mijap.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/86874446720.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984cbb350be---dadivukozibijezutukur.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/rafavin.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/25758283023.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/rasovakimojipig.pdfIn PDF document text
    • http://juentai.com/userfiles/files/gapufutuzotewofofuxokazu.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/dekinodexonob.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c339d5a191c---rojolodakubeboginoza.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/zigagozuzoluwem.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac968bca08a---juzaxewabogetometuga.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/xolopirakegomuwidapevu.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/riweronimivetarovapo.pdfIn PDF document text
    • https://people11people.com/uploads/File/xirur.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/85828674730.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_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 18656 bytes
SHA-256: 41d418c6c6d6d1e1346908e216a5fd67607c8df3803d8da4ea32594d8fe16e46
font_01_sfnt_off00010e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12641 10504 bytes
SHA-256: b50223108b69af97909a7e1fe74eeafc0b65ffdf96bdabc3d4ff9db833b00468

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