Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f78a575363d4da…

MALICIOUS

PDF

86.9 KB Created: 2021-09-12 03:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d7f04015fb0736001a82ae9ba8fa8979 SHA-1: 56c6b87abb20bd8ecb3f8578186f5fef02170b5e SHA-256: 33f78a575363d4da012bc1028d5fec670c77352f4b4c93be444b6b96c664d18f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised CMS uploads and 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 likely used to facilitate these redirects or further obfuscate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://daieimotors.com/js/upload/files/dogewobigirevepawiwug.pdf In PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/vonifotoresufodujuruwesam.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/98030659042.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/5f6de7a75790412bbdbf2de9dafdb025/99261166970.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/62529746825.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/8339448781.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/22087521562.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/jojosofamatepixexeburiwa.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/73811640049.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613753ee7eb04---kagemagu.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/nuzasopebomugurenaliva.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/sawasejibi.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210905_D0BFEFEA8A2F8836.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/migoxukexilowi.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/bedamavezuwe.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130748ae1318---4065131322.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/nasufijiwebawu.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/86076085488.pdfIn PDF document text
    • http://devveb.net/userfiles/file/67107870787.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613677861be87---54038932967.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/12326407385.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/zelakolofinafove.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/65a7d391b1004796785ad660466dfe5b/48189694749.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/25592554742.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///nemalelezor.pdfIn PDF document text
    • http://gugugroup.com/userfiles/57198586395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+owl+house+episode+12+full+episodePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F2 17368 bytes
SHA-256: d11627959930990e0dc4216f8513cc8db143d52833c090b2d94997ea717c5c51
font_01_sfnt_off0000edbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 18240 bytes
SHA-256: b722e107bd6423b0ff6ac5f08ae5225747aad5532441bf6ef8b270998244fa9a
font_02_sfnt_off00011d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D57 10452 bytes
SHA-256: ad64bcafb6ee660ffbfc08932ad6e9ceb1cb228a7b248f9d5eba9f2eff5f1141
font_03_sfnt_off00013557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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