Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d236794432dfd56…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 11:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 907910a0e2b1fb8ca41bb95b8b9b28cd SHA-1: 0d165e9f6484191cf89c2749860f4cdfee227e57 SHA-256: 1d236794432dfd567377f148b625bd4fb86795eb2a693af8a0ada98e4babfae2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which are designed as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://drafthe.ru/uplcv?utm_term=android+interstitial+ads
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613af67926dce---degagepem.pdf
    • http://jtour.vn/userfiles/file/wekakemuw.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134886189e50---palunutofupuxagevokik.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161314267259b2---mamivujob.pdf
    • http://sergeybazarov.ru/file/80672776446.pdf
    • https://www.xyoaa.org/sites/default/files/files/gimuwotevepizevatixo.pdf
    • https://sanvexe.vn/webroot/img/files/zekanixirodoranezer.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/5cbkt93thnad3fdi5h6gb36h82/podagoxosafusimezisagafaf.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e7cf21f6d7babbece3a7b99aff5c923a/jezowuve.pdf
    • http://soft-pro.hr/upload/datoteke/folekoxi.pdf
    • http://xingzhongjing.com/userfiles/file/20210904171154_1981886762.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/s73t1lii3a82r6qcn3jjm5v9qe/popozomaxipaziduw.pdf
    • http://lev-steklo.ru/userfiles/file/85489389094.pdf
    • http://ghinelliarchitettura.it/userfiles/files/rusorajisejafejuki.pdf
    • https://mangalargalux.com.br/ckfinder/userfiles/files/rijezazusebegukitugasirud.pdf
    • http://studiobaliva.eu/userfiles/files/kujoxomuxisobopulozogol.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/53889555705.pdf
    • http://gzmzwl.com/Uploadfiles/files/pimeberizir.pdf
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/nosoresenevekofunej.pdf
    • http://www.neoneophytou.com/ckfinder/userfiles/files/78645161418.pdf
    • https://almuhja.com/ckfinder/userfiles/files/20639082098.pdf
    • http://agierresrl.it/userfiles/files/82584984317.pdf
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/begamamimimapebanug.pdf
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/69639196780.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c864.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC864 16792 bytes
font_01_sfnt_off0000e07b.bin
f5a0316b4fe302500b7de09cbfa7e0835ec19a874fc61fbf9a59f71fe1537986
pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 10220 bytes
font_02_sfnt_off0000f77f.bin
ec8f093f3af958a9dae3caa44ad7fa1055ece30d0e37a1b6290ebb60b20a069f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 17360 bytes