Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad2db6589a689ab…

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 19:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d674f2337230da6efb27c6270b0ceba SHA-1: cee7d5925e1090beeb6554775303192a337db025 SHA-256: 7ad2db6589a689ab0f430c1f34b868699bc0afe2bc63b6be703c895813d52b78
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites 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.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bluebiz.kr/userData/board/file/89240189945.pdf In PDF document text
    • https://siangyun.com/upfiles/editor/files/99244881440.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/vapumopofigumudiregev.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/jokane.pdfIn PDF document text
    • http://rilta.net/userfiles/files/11312537706.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/fidemirunodivipeka.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210913125046.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/60432260144.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/dulasopeborupotodeselu.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/rovubigekemipodesosifefip.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/25438946841.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/baduzosubevuwonirara.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/839305406.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/83924393274.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/vesemexogelibiboxa.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/supuneniluler.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/0hs1jlbj2c6jboj306ii13m863/danav.pdfIn PDF document text
    • http://ranch.pl/files/file/tolekabageteso.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d4b83971b---1601192818.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/nabotavovekadezerup.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/tepokapowodu.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/62373649208.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dddd8e60b---kozurujorasiguz.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9eb307c5e8dd79f4fb72658388a5647e/sokaxegisojedenevizim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=best+apps+for+jailbroken+firestick+2020PDF 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_off0000c61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 18764 bytes
SHA-256: 99e68288a2dfef98fc0f1e44496edc45a2e4d38ffe03c8f9bbede8262ded09c3
font_02_sfnt_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 11132 bytes
SHA-256: d3f64c4472bfb5f7d41371f9347c65b01a559903cad97aea740c3d548990c23f

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