Malicious PDF — malware analysis report

Static analysis result for SHA-256 3200286a8439acda…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 12:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3341d4248c0c57fae440281c4fe920cb SHA-1: dc24c79020f63c64c834e1fff3f17ce55b429e8d SHA-256: 3200286a8439acdad9b650f9909e4d3708166715378d1fdde6ccf3002fb2e655
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, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=how+to+use+mms+in+android+phone PDF link annotation
    • https://noithathoaphat11.com/upload/files/7986338258.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/zuvedubirujidigugatas.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/kaximelesiwevemixefe.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4c4939d4---vunemudun.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/ratajalenasirixazadore.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/lotiletevaw.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/wirorakil.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/30414159316.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/kubevo.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132081358076---22539030478.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/5ps66dh1at4hil8gm4kkneo0vv/fubaxigebizapefojase.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210907200856.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/supoxigonuv.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/83253132084.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/40287047273.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5bcc7851d---mufejasodujapalew.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/kisebuwipebajujexuxa.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef699dafa7---logurexaniwezidotasiribon.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/94012313100.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/65255584072.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/tutinupunosuzik.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/xupevepawaziv.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_off0000e30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30C 17580 bytes
SHA-256: 1c18b91e8a8354687ea987afcd76a0df12249d4c3c21e6e679db5c44a2663576
font_01_sfnt_off0001106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12883 10788 bytes
SHA-256: 0bde9e0603fecc3b622cb45e460076f622712fdd56a637481921a1509e96ac82

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