Malicious PDF — malware analysis report

Static analysis result for SHA-256 b697b04fd6091eb9…

MALICIOUS

PDF

79.8 KB Created: 2021-09-01 08:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 68390dbb087f34e927521e85cd73f173 SHA-1: 7e48402eb1f6b34619e6a6d612cbfe11da02b74d SHA-256: b697b04fd6091eb9713977982f98ed92987bc959474a69b9e3cb98ab09898f3f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The numerous external URIs, many pointing to compromised WordPress sites and disposable hosting, indicate a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=gpl+mobile+notary+services+inc PDF link annotation
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa36459339---89404683794.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160bada413d286---33376524178.pdfPDF link annotation
    • http://gekon.net/userfiles/file/jafuma.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ff2eab1ff---jafaraze.pdfIn PDF document text
    • https://tepihtrava.rs//files/kozagotolopetideke.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780bc259155---podinavuwoxokuve.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/55285978249.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/74122544580.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/zixovidad.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/pasakibojelug.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/34cc2ebcc2d84cefcd9253ef7024faa0/pibimo.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844b5cb797c---kotadudidunozaxasuzofik.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/46543721035.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/57052033495.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/wunerenosonapa.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607544f7d96d4---47854115230.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/50658934854.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeab773025---78232760336.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f74de105fee---80405302327.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa2d52036f---29617323951.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/taxubotafik.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/15186203445.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/54105b4bd6ed37d57c58055ae0a4bc9e/wufasi.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/gatibemuvanafivijum.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_off0000d275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 10896 bytes
SHA-256: dd013489b4857e0c6b341859f02c2ffe2fbd75ac9761b8f89f0016d5904a85fa
font_02_sfnt_off0001038d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 17604 bytes
SHA-256: d8958ace88c06202f983760543964e5e6a90e2a67c057734ff3f9f00fcd3fd40