Malicious PDF — malware analysis report

Static analysis result for SHA-256 02b48883c3ecf1c2…

MALICIOUS

PDF

88.2 KB Created: 2021-09-12 18:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00f1dfa17d64d6db7bdd2a946826aeb3 SHA-1: 3b8e8878737404ee954f508761ca013cda370cd3 SHA-256: 02b48883c3ecf1c2b56488aa1c52f1b4e22bdf3a7500d3070911a82485cd233a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The embedded JavaScript stream and ClamAV detection indicate malicious intent, likely to deliver a secondary payload or redirect to a phishing site. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://svenskafik.se/uploads/fckeditor/file/76546945148.pdf In PDF document text
    • https://machnik.net/ckfinder/userfiles/files/4399500483.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/86851848272.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/88884953141.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/dixetemo.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344dc2000bd---jolejegosonitiko.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/92955260941.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/79904846590.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/24966822558.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/11a100875113933dd09050d889aefee6/vuzumizepate.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/41552040245.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/92057138212.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/18578393273.pdfIn PDF document text
    • http://vning.net/filespath/files/20210904202227.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/vajekefavaduxobunuxok.pdfIn PDF document text
    • http://ihdbd.org/upload/files/fiserekufasuserame.pdfIn PDF document text
    • http://geraldinekilkelly.ie/17726657179.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/didagigex.pdfIn PDF document text
    • http://boxethai38.com/upload/file/wizefumuweferolafob.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b49bed4948---keligutuwepazakinir.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/48303747194.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16133e98f573f4---228533142.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/54297901569.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210904_072215.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/biketosixat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sat+math+guide+pdfPDF 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_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 10584 bytes
SHA-256: 8092e05aeab8e88a606026af891b4d808bd8876931fa5ac68080c2f5a21324d8
font_01_sfnt_off0001096c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096C 19228 bytes
SHA-256: d3472faef3865c1d67ebca0c3f61a40447a7ee0335a034a1ebee7190bfe6b90d
font_02_sfnt_off00013bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1