Malicious PDF — malware analysis report

Static analysis result for SHA-256 58844b465bfe3769…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 19:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca16d1fab61726e9f3f8d4be822d590f SHA-1: 8c240fa6da040ac8c95aec8b24c9002084d82141 SHA-256: 58844b465bfe37692cb1c26687217e0da090465673b2ce02cbf55dc29a646675
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate the document functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://geologicatoscana.eu/userfiles/files/xuzigulowiletanezufoso.pdf In PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/safemerasijogorewelagu.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/2c6b0cb5e1300b238414f7f3a063efe6/29164296784.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d85477e0809---25893391759.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070036739211---kuduvo.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/xorotufadunanubigefux.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/85994247428.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094b86dbbf12---rujemopebakokozem.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077f790e18f3---rivasudalamatov.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/8lk8o76miqb6573lpgdicb9u5s/kesabumikililewesixoda.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/48725726202.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/menpjvmud85b5gqnose32m6r33/befonunejizeriduvidose.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/ad534de8d177bdbcf58aaed6f2455396/wuritusixipovifejidutifuk.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/65441390513.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/9506d0ca3faea41b5c91c274b6e0c1c0/resagezoxujurowuvuxa.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/74808234357.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/p8qurg67dmpngr7kpeqjttrrh1/80082130373.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/tulupi.pdfIn PDF document text
    • https://immobilgold.com/file/xifesagivomuzipumezomuza.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sdfrf98ptp8scr0kcoa1i82830/33595098987.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/sewasiwefepatofiwumor.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/46571240634.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6130bb715---79531062704.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/4387774748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=school+rules+for+teachers+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_off0000d4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D9 17724 bytes
SHA-256: 398118eba0c8dddb0db9fd4b81938df977bf3ea8caa2afce2acfa180b4ada06e
font_01_sfnt_off00010308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10308 10696 bytes
SHA-256: fc2eeb4070275de45395f557ad32b3891f7c5f580e1d3da5dcd1343a7d53d18f
font_02_sfnt_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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