Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d9d2d809c8235b…

MALICIOUS

PDF

89.3 KB Created: 2021-10-05 01:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3988a2cae714dc80fc1af65b9846552a SHA-1: 9b4e138f90b7b7c33ce8b7ebc4dad240a2c3045d SHA-256: b5d9d2d809c8235b0af44c34255684ee978f2d51195e3c7355bc3c18206d3ff5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to compromised WordPress sites and disposable hosting. The presence of embedded JavaScript further suggests potential for malicious actions, such as redirecting users to phishing sites or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://laborke.ru/uplcv?utm_term=the+direction+of+centripetal+force+is PDF link annotation
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/xuvojixe.pdfIn PDF document text
    • http://ciatic.saintelserver.com/archivos_editor/file/jagasadogosaganogafexativ.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/ferudinetubepa.pdfIn PDF document text
    • http://newcityhk.com/userfiles/pepobazetinamubikez.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/guzixadokusopikinifuw.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/kilefilav.pdfIn PDF document text
    • http://ridendo.cz/files/file/lozisajiniwumelojunix.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/jikidakojilam.pdfIn PDF document text
    • http://air-con.ru/upload/files/vuniwamopaverujimafimur.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16157fc55aba17---53203071654.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/gomuguko.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/56059500553.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615407ecc11ad---54406535629.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614f20f0267cf---daxivekuwovepawon.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/zodop.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/xinawodidakotibikakafel.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/42393374528.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/36227115849.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/bumuvadu.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/jakizawatoxetapone.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/63758708223.pdfIn PDF document text
    • https://mkontroll.hu/File/23352589816.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408cc53f37b---juropatumewawer.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/tuloduforatikepopozewiro.pdfIn PDF document text
    • http://lonsdale.ee/tipikas/uploads/sisupildid/xerasu.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/feranenadelal.pdfIn PDF document text
    • 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_off0000f4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEF 19284 bytes
SHA-256: 00a6a18de01117c65a1eecc18415fe374bdd58847487ca3f6bed59a3331b7b8a
font_02_sfnt_off00013eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB2 10680 bytes
SHA-256: f80afa062b9db09f658846b90b05c8c8e45654c9329e55fa0ef4f6668ccf3991

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