Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35749da0f7826e7…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 23:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f3f04980627e176327231877dec50ba5 SHA-1: 04d3d5f173d96b23035aaa5e79db602eb90544f0 SHA-256: c35749da0f7826e7a6c25d4d4ac7de631378f9b6b37979c47c772eb2a96c7026
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://sambelteri.com/contents/files/50638958512.pdf In PDF document text
    • http://zagazzo.com/userfiles/file/xuzagix.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/zovofutedaxef.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/48620867731.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/60267916120.pdfIn PDF document text
    • http://theponghop.com/upload/files/4868462049.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109012318328309.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d91c483089---tovijikigokaxeb.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/wopoxovoxetajokuwaxud.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/7917c65c2b5473c16e09396f7c35f413/75472539467.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/sonipogoneruwawivametaf.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/68990413053.pdfIn PDF document text
    • https://ubranni.com/uploader/files/podafijaz.pdfIn PDF document text
    • http://dongphat.net/upload/files/rajonimonenujobitos.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/07/tokep.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/wamiraridemagorosok.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143096225cf0---lupisej.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee120590e3---50858427266.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/bd76bd7da29cb82bbbad6c6e1812e92b/61201581600.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/sebadujivubefom.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/56191271909.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/zemifakefogoji.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/99339869742.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/zefajitiwepasagetefepe.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/wawesiwapuxozi.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/gasozapodi.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/xikabovev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=my+success+story+business+mod+apkPDF 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_off0000e3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FE 18092 bytes
SHA-256: 8600e750301c685c1811b58e2a26cf53abc1accedc5a08cde7d3596445a98c75
font_01_sfnt_off000113e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E1 11068 bytes
SHA-256: db9fa9e267325273635ecd801a6b330350cd3d517930e748bbf7cda5b9ff1440
font_02_sfnt_off00012d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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