Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6cb928582c6dde…

MALICIOUS

PDF

91.9 KB Created: 2021-07-21 20:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 87224283cc333b103c85389a60e1c031 SHA-1: a83cd58aeffe0cf8b56738e29f11f1973875c47a SHA-256: 7b6cb928582c6ddea10268b699eb4f41666271009ea7901b760e4c00c7788aa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e32283f36---soforumivuli.pdf In PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/50c43143340b7ed9db1243df48f19d91/57281304185.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/3d13b628cf1e2a984c290cfd4c0390c3/59336427875.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/tisamusedewinemo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ailua3100gdsd6kg9j5v1tpue1/7231385313.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5575edf43---25219272058.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/384df7b1dbe1cf56d6e353f7cb513759/nowafadowopam.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/vutudukaxorodaxe.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b519c526e40---88314312410.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/50720787457.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/20818017403.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2443307d26cf55c4577aaa1a265b4a24/puwudisugowozafosusesozod.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/c10b8b00d4e452b0b86812402c0f36bc/43517522511.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4e6724e5f---59291067729.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee699ca72a5---peradexi.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16079682bb2ba5---muwofofalerotosor.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/s83df0cnsqq6746hul55vjru56/nenitavokamebefovemid.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2ca2e62c---18564835666.pdfIn PDF document text
    • https://badoza.net/userfiles/file/64895360298.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/8fe03ad734c4b3a9ce7da1fdf0375a0c/lagigivipuzo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tp0od2d6ba9kh11i4u55jej3r1/94241318993.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/musigavazesemalozakan.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/ec124c2ae9aacae6a2f3e693dd154d2d/janeximilozusa.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/37923804511.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/rt63vod31v5m7a95mkikvveomi/17348771571.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/98239536197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=macbook+pro+cooling+issuesPDF 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_off0001019d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 10776 bytes
SHA-256: 8768197a5d53c5b95cb23c75c12aa694a70fd304d2a0f91966b2d4bf0ab7995c
font_01_sfnt_off00011a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A51 17888 bytes
SHA-256: e202ca7a7a2c78e81bc1d2b8ca6d2176bcafc6389f219f9e5b0dbe4c9d4eb91d
font_02_sfnt_off00014963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1