Malicious PDF — malware analysis report

Static analysis result for SHA-256 97528ed0317f6bce…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 10:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed93775268a48b0a130897db3c7303f9 SHA-1: 713cd2a70ac96b70260261ca487f95322f3a768c SHA-256: 97528ed0317f6bceb201476e7cfd53c2610be71300a91b06be9dbe0dd2f2b0d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, indicate a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware delivery.

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 http://dsagco.com/Upload/file/82966839556.pdf In PDF document text
    • http://nsdadventist.org/FCKData/file/83012018943.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/delokureduwerajezelokep.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/79521422933.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/bivusugapatazadoxilep.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/linutigazag.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f53b3cf42---vaduzaki.pdfIn PDF document text
    • http://ranchobg.com/img/file/27944996134.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/691cscj7ogddoh5p174mnkg2f4/3934634287.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9daf124b3cf7b279330ff64ac29e6f32/dufisome.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/puxigazim.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/53066450292.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/farorivupuvinulunas.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qhj5ohjtg8l1bv4q7shektk07e/nulalixawa.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/d4e609a379e74e06ee9d19c44e2b8755/butepugitutozi.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/zeriwezi.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/jivaw.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b1e6a60e75334bbd54994c576550ff6c/napewuzides.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/ximotegibosi.pdfIn PDF document text
    • http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/fabopotuvipalutuve.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/tezojirafaninuguxon.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d97f536260e---46942439073.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/mivowusadotadepoxes.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/45843006162.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/gokenimememijasugozigezug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=can+you+make+powerpoint+portraitPDF 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_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 17924 bytes
SHA-256: 29eca0a22224e2fd6c125e20787ac0b467af552d24c163a707eb78e87b955bde
font_01_sfnt_off00010abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D6 10624 bytes
SHA-256: b5071db099ca037c7738c31f428d9c204fef5368bee0280b63556f1b4afc65a9