Malicious PDF — malware analysis report

Static analysis result for SHA-256 e941480653b05baf…

MALICIOUS

PDF

79.5 KB Created: 2021-09-21 18:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39be6dc9763ae399f67a4d8bc3db7f27 SHA-1: 8a9535a51596e33d5d3501775ce42506b558be2d SHA-256: e941480653b05bafdc0d53e24c75d3b38ce6432954329e6ee69f87556c41ad11
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to potentially compromised websites or link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to redirect users to harmful content. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://synerhu.ru/uplcv?utm_term=4k+video+player+android+apk PDF link annotation
    • http://novosib-sport.ru/ckfinder/userfiles/files/jegimivatol.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/11028558730.pdfIn PDF document text
    • https://adikkedua.com/contents/files/2283098042.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/kojowaxuvuvimadaxivovun.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/fevuxuliwufekovekokofaki.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/76599761629.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/sawakozudoxigubokural.pdfIn PDF document text
    • https://mytopics.it/uploads/file/ramafimilijekogik.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/pebas.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/36390325054.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/18276841184.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/labisovopan.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/92513736935.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/sudexo.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/sedorejizunafejojobefa.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d2e422a94b970833e307b390cc00ad78/farutitabazugulavexel.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c4bbcd86306c890ec803de2fc2212cc6/rigekifir.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131a118b0029---19579971326.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/47947927966.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/nesokoxo.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/56224298539.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/wodilevarojan.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/kujikedodifaxagixajitu.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/guvazedox.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/82770056144.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_off0000d091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD091 10372 bytes
SHA-256: 7b3bc272d1b1b6ee588117766070b09a129cfe9dba797d39edf7afe7eb0d822a
font_01_sfnt_off0000e814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10026 19028 bytes
SHA-256: d005a48a87a0ebc00ea19fb69dc4a42c2b08547c3c0476ed6c72e5696f2ca495

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