Malicious PDF — malware analysis report

Static analysis result for SHA-256 61683619eae8629e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-14 13:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ef2e57a5d5c1f9f7e14a5cf065dc31c4 SHA-1: c6a89c3fff36863ceb0c4c201180976392cf5d46 SHA-256: 61683619eae8629efea9be965090c6cf9ff7babbeeb928ec5a7ea469f8fab09e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, including compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the overall structure and URL analysis point to a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://o2opr.co/userfiles/files/xogikizawajumuzekepi.pdf In PDF document text
    • http://giadinhlaurenso.org/upload/files/71257207089.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/wimam.pdfIn PDF document text
    • http://kasargod.net/uploads/file/depivolepaxizazupelajo.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/zupudofi.pdfIn PDF document text
    • http://asja.ua/userfiles/file/mulokezisalinujeluvubobu.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/a236b76cceaba5ca03d1d5d89c9ceebc/fivuvun.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/powomenelajefesegepazexaf.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/tuxuwimu.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/baxesuzunutujuzuwelak.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/82753904396.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/28662998645.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/natab.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/63445991794.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130f1aadfdb7---12700844487.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/fodofijegonadugizusineki.pdfIn PDF document text
    • http://matras-devison.com/upload/file/20549729698.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/bowigozisuwax.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/39519260178.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/zokipegejovorajunega.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/25fb18d7c9ee3ff59e6a1b9db7bd3ad2/52384834469.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/fibufagegesaderojono.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/65076793416.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/xejuwejagowiram.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+the+use+of+androidmanifest+xml+filePDF 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_off0000df12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF12 10816 bytes
SHA-256: ef111e4e0f7ebf43d4e473611bc860d0c533ba78d7dcccdc0a10b6f7050bc97b
font_01_sfnt_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 17948 bytes
SHA-256: 85da6bf5b740abe300af76149af7fa938cd525682df84c4b493224cda5d35201
font_02_sfnt_off000125d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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