Malicious PDF — malware analysis report

Static analysis result for SHA-256 19bee2449bfb8d5e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 09:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16635d6d46a4fdf4565f49c2d7682e5c SHA-1: 0c4a67f9423e597131568315343a7f7687741229 SHA-256: 19bee2449bfb8d5efc9233f41848b243630d542f8fbf55f98798535c8220611f
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 likely used to facilitate the redirection or exploit vulnerabilities.

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://queure.ru/uplcv?utm_term=voice+of+silence+full+movie
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210901_1747C39A10E81FE8.pdf
    • http://gat-asset.com/CKEdit/upload/files/juvoperowupizupemasa.pdf
    • https://luxesystem.site/js/ckfinder/userfiles/files/26627390840.pdf
    • http://baheth24aqari.com/ckfinder/userfiles/files/63545302442.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161333c3b84303---tiviwobarepiwad.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/dozoxefagoferozetikutoma.pdf
    • http://verkaufs-akademie.com/userfiles/file/42871223905.pdf
    • https://middletonchambers.com/ckfinder/userfiles/files/15446073286.pdf
    • http://jiuxingchaoshi.com/uploads/file/010901513510.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a5298c740fc93d664f7aa7007a2344a9/85107612675.pdf
    • http://apsons.eu/files/file/21862985511.pdf
    • http://rhondachem.com/d/files/lipodeligulebusov.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161362672d4d5f---7865926176.pdf
    • http://bluebiz.kr/userData/board/file/15778072964.pdf
    • http://jtylek.pl/Upload/file/59798465843.pdf
    • http://sparan-art.ru/ckfinder/userfiles/files/41958680212.pdf
    • https://pamukoglu.com/userfiles/file/guxurubitifexigimuf.pdf
    • https://giridhareye.org/ckfinder/userfiles/files/4764178149.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161364ab0b1021---wusaguxago.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a5bbf16a3---diposopobumamifunexuzer.pdf
    • http://guojingmall.com/userfiles/file///ramufiferamojaworaxujivor.pdf
    • http://test-immo.com/file/22017389117.pdf
    • http://2990592.ru/ckfinder/userfiles/files/91660086653.pdf
    • http://abworder.com/uploads/files/90452970971.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da67.bin
9c998e92fa1ee4095087c02f8e9eadb52d81a7fbf50abccc09b5e5ddf948dc63
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 20568 bytes
font_01_sfnt_off00011073.bin
be5b86b4edf822998340cbaae16532fa20cf12a80050081fa6a8e9ab26b34cdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 10272 bytes
font_02_sfnt_off0001278b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1278B 16792 bytes