Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2d3f293fa83cf9…

MALICIOUS

PDF

85.5 KB Created: 2021-09-04 04:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b86334008a19ef01d28c91bf723bbff6 SHA-1: 1b7af5dc6aff6a7a4c3ea78079dc950ab35996fa SHA-256: 7b2d3f293fa83cf95e896a402076fd7eeb17580bbe2e498f7689eee3debb84d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a link farm with numerous URLs pointing to compromised websites and disposable domains. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bd-sokolovska.eu/userfiles/file/2386269903.pdf In PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072f4d875d6d---74199902715.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ba36090ce---kalulivuvasetefo.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e9755d2b78c---44173206379.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/belilijig.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/12422423039.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/72192783410.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/42346077817.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/komapadaz.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/10cb081697205fd1fcc9ce52086f83fa/wakesalikavipuvifo.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/jabonewoderigufo.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-14/20210614010353774064.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/naziwovudabik.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/57305153082.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/090f1857bf5357bad0457862153ece12/21521150527.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/91788561578.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccecbd2be7---rumepejeranifu.pdfIn PDF document text
    • http://gillyard-johnson-mahoney.com/clients/62114/File/38966090334.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072b86191edf---80951593057.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffcfc0a2e3---vogowumixofiti.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/98680125670.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/fojamixiziw.pdfIn PDF document text
    • http://riceart.ir/basefile/files/zimezusedemebimidima.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aba79730a77---57311734596.pdfIn PDF document text
    • http://hnspkjx.com/d/files/kixatemularomajotoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=constituci%C3%B3n+ii+rep%C3%BAblica+espa%C3%B1ola+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_off0000e62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 11344 bytes
SHA-256: 1b533147661e5bf58ac572e0aee03bc11eeb0657f803a4a8b681c85e288a41e3
font_01_sfnt_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 18044 bytes
SHA-256: 9f3e7ca76accc083bcbf0602208739a5c721b49838a5df916b9ffb15f50de995
font_02_sfnt_off00012daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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