Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc159a756ba7a17a…

MALICIOUS

PDF

87.3 KB Created: 2021-08-20 06:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7cd99860c3024cc8564948d21fec7ff3 SHA-1: 77ec5a4192b8a3fea8dff11958696052867852c1 SHA-256: bc159a756ba7a17a70fdefb8fd74a79a7a1719f1c5cd0139cdb7c0ecf1321ae9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or conduct phishing. The PDF structure itself is indicative of a link farm designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/a10377c1479fe1edef4021c1d4e6557b/43422181814.pdf In PDF document text
    • http://weberstellen.ch/userfiles/file/xirazemiwajutipe.pdfIn PDF document text
    • https://12shio4.com/contents/files/silubezosozogekiwese.pdfIn PDF document text
    • http://msiutilities.biz/documents/mutokato.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/54027495455.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa907f3b8---dopinuwe.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ead6bf3d2---luvogex.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/842cd1abe8a4cdc7ad05b85f5a3a090b/94689053452.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/bepobapor.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/f479375b22390946ba2332ffdbfd4d0c/fugurowowevajudezuzonemi.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/d19a6c2ded7f30f15dec2bef6d34a1cc/solajor.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/srq797o9045re82g0ttire11hk/datiwi.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/20969459372.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/jidowumu.pdfIn PDF document text
    • https://sambelteri.com/contents//files/mifivuxir.pdfIn PDF document text
    • http://decaiyun.com/upload/file/21062303530071152455m76b9c2pgj.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d554da45c403b0755a9594466c299196/sogamejupadodavitemuko.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcbba408c0---xedutajapuda.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/guvegatexewanumafofa.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/vagowikigotaratabutopi.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/43462568580.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/2978237429.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/mosowasotomuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=velozes+e+furiosos+9+estreiaPDF 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_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 19888 bytes
SHA-256: 31811d98a2c766b5a1926e83af6068f648591f2ede41d5816c76a9a4cb5b4a7c
font_01_sfnt_off00011cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFF 10400 bytes
SHA-256: bfa43ecf0399eeefa865dc15cec3513943434bd0207938e1f92748b67d14badd
font_02_sfnt_off000134d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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