Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a8b9146c7001df…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 08:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3de99c4afcfef9808c48658e9dfcec4e SHA-1: c2015299832da4063b74a8061aeddd2456db8861 SHA-256: f2a8b9146c7001df5f25d0b40b966b413611cc44b105045ee44a8398365e72bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous links to other PDF files on potentially compromised WordPress sites and disposable hosting. These links likely serve as a redirection mechanism to deliver malicious content or phishing pages to unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://conhantaoankhanh.com/webroot/img/files/sidatibogovedafifuburu.pdf In PDF document text
    • http://beachfirebrands.com/userfiles/file/zedebovivet.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/39935521106.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a703dd4a1e---tifudofasulepixaranepodek.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6b3eae4ae9fc076a31ca7d379db02eb3/58427341351.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/86019979406.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/mifutavoniraxuvotilikapo.pdfIn PDF document text
    • http://momsystem.ru/public/file/sazufu.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/mekezejeji.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/digifozufulowig.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/jisegapawoze.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607719fa78558---pareduwinufibaful.pdfIn PDF document text
    • https://tepihtrava.rs//files/dutarawowopifa.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/sapekefusagefif.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ec291b23d3df58518323e59525a1c9fa/wokizewi.pdfIn PDF document text
    • http://waltripclassof74.com/clients/8/87/875eff38522a6836d9fda94c5a2b6b26/File/ledelegipunu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e1dd135a1---76210547083.pdfIn PDF document text
    • https://drlanda.hu/user/file/10781908682.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/21414432543.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/88201540721.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/petut.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c160abf01---rajegononotowum.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/61dc3d0e1a04d45a9a4da7321b43c878/tigodedowebekepuvusosok.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f90aa3607fdbddfb60fd41df4142d786/32505750509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+battle+of+frogs+and+micePDF 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_off0000e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 11024 bytes
SHA-256: 72c8de521f3b4ca2a73490c9d10cb83841fd550512683409841095c286db6509
font_01_sfnt_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A82 21400 bytes
SHA-256: 76a04e4505490664e4fbb085ab134f44bd2dba7a20b0ddc06ecab4977aada7fc

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