Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dadfe2852c1076…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 04:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c441a2a710b5e2708731333b53fd405 SHA-1: 0bf87383a8355b8373306fcb142ca64b01750661 SHA-256: 81dadfe2852c10767c13841d9f66969987e7c994473db57b3a79e2d8995e9c19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. These links likely serve as a lure to download further malicious content or to phish for credentials.

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.
  • 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://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b648cb5cff36fd813227b5c71761b0f7/97076380628.pdf In PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/nigumalarubuxozozef.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/34593177856.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/62763219254.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad11db48fff---35458871939.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/90687259209.pdfIn PDF document text
    • http://amandamaitland.com/images/file/67141967268.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/pitou4n2vvorihs0sq5rm9187p/jotaj.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/47953990994.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/fcaade614558beab6fa60e95e2de644f/93400275064.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/23965487439.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6eda881728---31155881602.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/98632125242.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a58ac3cf9---buduzonegum.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/46890202129.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/direkujaguwunikur.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/96341466308.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/82979677542.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/18153065097.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160882779308c3---wudugikazonisusikojenadew.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/27530562346.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/364708396e8025a46fe90bc7ede97c0a/37370093098.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/nuzoboda.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/mekalodezitaveneze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=tomato+nutritional+value+pdfPDF 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_off0000db0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 10620 bytes
SHA-256: 959350bfca29c5bf4562042970d4ff5bf35fc928f0c459d570e69ee35c01f01a
font_02_sfnt_off00010b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5B 17688 bytes
SHA-256: 0a2b0c3529a2845f471601e0347eec5c16863c24f8d46cc0ab70b8f132878385