Malicious PDF — malware analysis report

Static analysis result for SHA-256 833d90c94298022d…

MALICIOUS

PDF

78.5 KB Created: 2021-09-10 23:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0aace295e8c98ee3bb538d4b5fe30060 SHA-1: eb141936ebc742b7e2de31874fbf35c24117955d SHA-256: 833d90c94298022ddfaa8d088e4a27b8c0010352e8335dc86c4d1c613e61cfbf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nutronicltd.com/userfiles/file/kiladutikoviwopebeleva.pdf In PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/nusototikedu.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/76207510845.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/52at1tf7e4c2vjtdfohn0837rh/banunewo.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/pufov.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/lefiviwizewukejuzasut.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/putetipixarabuxov.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/16276674811.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/91298541174.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/dilixoxedunewiwuged.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/dazosem.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/15409835431.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/javozutomibobip.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/dewegovosuvijetozej.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/sonobobixexiwejupetoju.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16139df686615d---suvexibaxusu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aec4e756bd---1765068757.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dbd0bb78b---67319711455.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137771e900f9---8188271236.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/47953758492.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/5cab6382acfdf0b3c3c2eea568de1fbc/89664600918.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/seteg.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/66288261828.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/dovujitobavijumisulit.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/fowinikakaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=shrimad+bhagwat+geeta+download+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_off0000c5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CE 20196 bytes
SHA-256: 39bc47ebffc5d8bbeecddc7a50b234b9f1ef3a6c703dd8bee9c5ac7d2ca27ecd
font_01_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 11076 bytes
SHA-256: 8ae02c037f8fb7ce94cb4a123c5d6b1092d6bb08e5632b89018b91e107e95100
font_02_sfnt_off000113fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.