Malicious PDF — malware analysis report

Static analysis result for SHA-256 99030e98803bb219…

MALICIOUS

PDF

85.8 KB Created: 2021-08-14 20:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e332bdde95c12625023970197c40fc01 SHA-1: d16e94097ca6c360a75ceee92b5ba64fb69b1bcd SHA-256: 99030e98803bb2190a2df996cc859ad71f8a04e11db4c20cdb0d2120a101f379
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=how+do+you+use+wireless+charging PDF link annotation
    • https://33mobility.net/uploads/files/xawazipufufugufagugazerip.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/xewoxavavujenazaxosavelet.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f078c4ff32---46190457121.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/botifagabemufex.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072cfed0a949---zavaxobifupanifewife.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/79420826678.pdfIn PDF document text
    • http://skupka23.ru/upload/m/mobemekikanikaf.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/33344714831.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/78354372610.pdfIn PDF document text
    • http://debden.org/userfiles/file/vuwomitazekevodixur.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/170e99f259fc23a30d3c7f0c326c57a1/datasipulifenelame.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/zixope.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/defowi.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/32400777235.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610b6c3c2b4ad---31068401842.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c46e4c0c8a---16496639656.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/vubabigokoposewokakasi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de4bca8dad3---tadojubow.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/15db49aa1c7ff0a00cf902ee50b40eab/86578564656.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/72078308706.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/vadakotemubu.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/99668574062.pdfIn PDF document text
    • http://18554080.com/userfiles/file/28395300450.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_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 10844 bytes
SHA-256: aec42c396c22fd6bd04af5cc77c9e0a59de637878d4eab0fffa6793170840a1c
font_01_sfnt_off00010540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10540 17104 bytes
SHA-256: 5fab19061f06a95b294c518f9b53b4e5314da653bdd49749649323b2f4ec7620
font_02_sfnt_off0001319d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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