Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54553a86231e5bc…

MALICIOUS

PDF

86.9 KB Created: 2021-07-18 10:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4e04584eeef43a7179e50a34d0dd0568 SHA-1: 00e9ad36ef9c499e8bb9dd11bf9833d2ccf4c2ac SHA-256: e54553a86231e5bc50b8e9476b31a8a1cc0bfc49f24bd33979fcd79190823173
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lead the user away from the document to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://transport-vehicules.fr/userfiles/file/mivogizugo.pdf In PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/eb4960621ef87ef51df7504b14269adf/88621663089.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/mofakewa.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/pumetamimudap.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/apb693pt7vc59c4cjohbfvru81/56154508329.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/xegizobosibukaxemo.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/5f7425c7ac76fd26b05a3dbb2e2f922f/30835088268.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52b185ee75---65848320950.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/21lmlnhs68pr8cjc1d3lnp30r7/limidesamuwefo.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/wibodazoruzowu.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/14026243844.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/22723138893.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dca0902304c---kusalakoloputawekupajiw.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/7bfd9d32f8fb8ca45e1f3960bd720eb2/xelirabewefewava.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/bunonagawekafi.pdfIn PDF document text
    • http://www.polni.si/Images/files/88876929212.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074905e656eb---63912388802.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa2543d0f---nuzevodanemafunusidosufew.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/dazetujoderoneligebariti.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210714043148806.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160eff1e3f1b06---lukepilanu.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/56999896695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=harry+potter+deathly+hallows+book+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_off0000ee8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 18092 bytes
SHA-256: 7bc2b60078127ba3a98f9d957412c6ab6207e4fbd48cad49587d0b3817a5a0ac
font_02_sfnt_off00013563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13563 10824 bytes
SHA-256: d7e7829e68ef96f34c2f6aaef4d81dadf5de572201cca4a37801ef5c089b4a07

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