Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efae4e0ee4ae93e…

MALICIOUS

PDF

85.3 KB Created: 2021-09-09 17:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ede8a4c479719e8ab9acdb89422be182 SHA-1: 69050ec6e6929ed833703e9cf7fc5959070867b7 SHA-256: 4efae4e0ee4ae93eead0d051620e57967d6315c2e4d98417dd67c39dc6f07ad3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o92va9if97te4o8nre4rm90002/9035401170.pdf In PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/wasidutorumamedi.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137a8c4ec3dd---45951362582.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381b2e98da9---67888864411.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/laviximaxijorivebirikep.pdfIn PDF document text
    • http://zamgph.com/uploads/file/020836397476.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/65153962547.pdfIn PDF document text
    • https://norservis.info/files/files/36685864492.pdfIn PDF document text
    • https://oferta.lt/i/File/kagozewujudedozodiretige.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/24884460998.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210902212721699128.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/divulesolofabowabane.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/wogawumora.pdfIn PDF document text
    • https://sadex.pl/fck/file/losowojataxem.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/98928719579.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/34111987875.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/fikofijuligova.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/e6dccbfe13faec31494ac0e4580b9e0c/28728411226.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/32525615770.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/7ae3c0cbbf64523cc3cfaa1dff9fd5d0/kumusesejugikitibonep.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/jufarisig.pdfIn PDF document text
    • http://balone.net/_upload/file///10016182213.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/fuxalilebum.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109020812314758.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/6c6l52bg5jmjvdvdl9p5vo6mv3/sazitejiw.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/fupilovigilifanerabebud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=spanish+nouns+that+start+with+kPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 10524 bytes
SHA-256: 6df3d9c2ffbca1c0dadc930bee59c95b35638b8669e79ac6437757f2de7c771c
font_02_sfnt_off000115d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 18648 bytes
SHA-256: acf3721d8448c1fefbcb4c6c3b54ab39db5d71f906d9c2a2fcb908540d596d47

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