Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b08b1741989fcd6…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 22:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef151d532ac5a98fd408bee298714c89 SHA-1: eb7152f5c74db6e53f68936ace5a196a528bdfe2 SHA-256: 9b08b1741989fcd6d9408b024f1eb9370945eac7da461a80fe8aaf15a394bbd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to PDF files hosted on compromised websites. The presence of a link farm on disposable hosting and compromised CMS uploads suggests a phishing or malware distribution scheme.

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 https://smidgel.ru/uplcv?utm_term=vidmate+app+mp3+mp4+download PDF link annotation
    • https://serihosting.com/calisma2/files/uploads/zizukaj.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/lekixopefuze.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/12392255093.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/73098729454.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/tilepikikajatulabi.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/76907665197.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/sidura.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/lagonaf.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8auo9224es30bns5glvn9at9d1/wadibakogixit.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614307f5c290c---14917351735.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/jefatuvakasajakaba.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/16665630493.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/34545666556.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/97701130172.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/xanogifatevirukemujose.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/wuzezanov.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/jowojubaditepezurefak.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/4986739763.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/7552905044.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/59442437516.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/86514611850.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/wovumizuzujokozaximuke.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/tisanav.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d80b3fcdc---jimetubo.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_off0000d64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 17236 bytes
SHA-256: f3aaef4a35a410873dd62601e5132c55485013eece0f7232502b296e62c78b89
font_02_sfnt_off00011aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEA 10592 bytes
SHA-256: 67ccd586270dcc440f3fd80bd034bc470c58c69768433d9405b0b1602284b82e

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