Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fbec3e03fd42f2…

MALICIOUS

PDF

94.0 KB Created: 2021-09-03 05:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c445ca78fc57a2835ca9b54f9d119e6 SHA-1: 76953516c427c41cba39c8a4200cf04b3adb2b47 SHA-256: 77fbec3e03fd42f23f9cb393114d2e12adef2f146e2a98abbd0b3a100f347624
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The PDF also contains a link farm pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://kubkao-kubpla.com/userfiles/files/bonijijuvepilujipana.pdf In PDF document text
    • http://pressvaluation.net/userfiles/file/7854144289.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160969cccd7990---24162791301.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/24596594086.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/48917543909.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109021722452659.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/tufenotabonina.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/90897436818.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/73555190640.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f15cb3086c---99573034242.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/78821588567.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/vilisar.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/76647416574.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/98914528945.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac673b325d4---fapaziwufedobigasija.pdfIn PDF document text
    • http://eva.am/files/ce9c7d51188f2c3c.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/18476519884.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/raseroxubitukuwijafi.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/woganubetujozifom.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/fisar.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/vajuxo.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/dinorisonobalusasikaluleb.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/2ce8e0e33e564681b0344a5fa9ef62a6/garukowisosogegozujo.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/3fc392dbea1a1ff5390b7dec59658fa0/4832689374.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/57247723050.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/15629492737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=expression+of+interest+letter+sample+pdf+ukPDF 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_off000106f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F09 10936 bytes
SHA-256: 5a13c6afb1882211d85b4d1acf533200754780077a28230745fded3374848e89
font_02_sfnt_off0001385d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385D 19004 bytes
SHA-256: 96c6268eb5b31b5a1993481351dfc708b4d3887fef671d22d0b084df2fb740d5

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