Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7da14d40d9a5e8b…

MALICIOUS

PDF

81.8 KB Created: 2021-10-05 04:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e67661ffa99201a66459053d676508c2 SHA-1: 200c4892b83e4eb8593911a6bcc2961d5008eccf SHA-256: c7da14d40d9a5e8b21fae7843a50af0474d92b589f2487bc80a8552045ee92a1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs. These URIs are structured as a link farm, with many pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malicious content. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload from these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=it+chapter+2+download+in+tamil+isaimini PDF link annotation
    • https://efficimm.fr/userfiles/files/23275582531.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161597cdfdf2d7---pekigapatepuvuj.pdfPDF link annotation
    • http://natpuedu.in/userfiles/file/53543256419.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/nepomusax.pdfIn PDF document text
    • https://xenonsvjetla.com/files/4454356085.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4acc169a3---xanuvasopid.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/fuvogabofesozakinofizar.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161580f1377378---79768827281.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/xagivirawabetoxat.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/95265450794.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/2a90194a314ae7243c7982a91be8a77c/gutubusemobowazo.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/vinivepamejaro.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/mujusipu.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/wixotojosuxefirixopofetix.pdfIn PDF document text
    • http://dogable.de/userfiles/file/sijipa.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/zazefan.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/kevotabepugifu.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/vedixelow.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146afd2e2124---28249058090.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/sogoxutavobofasorom.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/kowez.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/jifopaziwonilafetigiraj.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/titiwukudoxorezutewe.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/20090055763.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_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 10936 bytes
SHA-256: 17e3c4c78cb0c9dd3ee9e750f367bbeccdb83595fa602b9f9c75ec38017aaee7
font_02_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 18840 bytes
SHA-256: cbe8eb9c93c1bef716ebdb77f6dba3f434119ad8f90213ca79c3b85d4d81281b

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