Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5684d1f2c989bab…

MALICIOUS

PDF

89.7 KB Created: 2021-06-25 18:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 262739d68621f794d4201e62d35834c3 SHA-1: 87690f721b4bac4397b84572b695f45db6aee38f SHA-256: f5684d1f2c989bab5962bfa7632466ac08fbe935ffd99b2caff66556df20ae99
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document also contains instructions to disable security software, a common tactic in phishing and malware delivery. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c864597981---49247351525.pdf In PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/pegafumixexuvafozowafe.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gm19788abqrqd8l4av2rnvvb1u/12370462599.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed2e42707---72151109177.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/89476968432.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077ad43de6e0---dokibalazuv.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9942dc92ef---26255830624.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8c739e610---nemogasisazakefa.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f80da3df3048f33a2ca057b9b521a01a/niguxunafegeforopoba.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/viranituz.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/sudevuvikamifirorezepo.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/35338410146.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/e5438afe394740dc9d8bd30dc77f7be8/dibakosix.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/dugew.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fd00f3317---79444614912.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/ae76c6fe222bae2cb7f3eaa5faa5face/3998529571.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcac9dd380---novajuv.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/37747123606.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/21273848232.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/wobiwem.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/cl0tkeds7bhdp6vho382ioe9c7/navamazuduja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+uninstall+pdfcreatorPDF 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_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 16948 bytes
SHA-256: 1d940135aaa432b57c7fd7fc825e15d64a8b09242fe1633c255efe63cc053c9c
font_01_sfnt_off0001287b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14092 10792 bytes
SHA-256: bc7fe0f98a96a4808fd6de008f804ee1ab8949b8d2b8457a2660cc588b97ea6d

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