Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33476766df71d1f…

MALICIOUS

PDF

70.6 KB Created: 2021-10-04 07:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7b15f1ad5b9d6d60a02eb7f2ee2da727 SHA-1: b262613d2942ae704ac7b8bd7131981742a2bd01 SHA-256: e33476766df71d1f3752dba62ba9144519953c215799d5bddf1b8298b74ea7a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/fd5c3a4e74bea139f4c3498be73cfb32/tiribotovumaxikagakugug.pdf In PDF document text
    • http://elsped.hu/files/file/nogavetedusoninavajulana.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/podoxuwudebitogonoge.pdfIn PDF document text
    • http://sin-hua.org/userfiles/jamumanu.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/serimabisuw.pdfIn PDF document text
    • https://harmony.im/userfiles/file/54542442806.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/vefesijotiruloladobabera.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/gojanoluwuf.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/zigido.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/voluzixew.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/40705625544.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/49103848727.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/befenojidisolunoxozudeje.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/28800334158.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/batabalonekozafegob.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/51439631668.pdfIn PDF document text
    • http://rurisnet.org/images/file/85006572191.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/rakebupogobojunu.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161494b3babb33---baparuma.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/44594c648c7905300439705885f1e42c/fodetitezomikusuved.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/paleweruwisizutigukabufis.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/melefuvavirubawokawibos.pdfIn PDF document text
    • http://haki.vn/uploads/files/29787681801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=normalized+and+denormalized+data+examplesPDF 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_off0000b27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27E 16208 bytes
SHA-256: 83517efeb79cd1342a743318b8051f327096ac1a35f28f652766b165c5cc14da
font_01_sfnt_off0000dba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA1 10692 bytes
SHA-256: cc273c9c81f1a07c833701b38307c4cc589f7428ce0296d1502efa2a3684813f
font_02_sfnt_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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