Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c8a943b34197c0…

MALICIOUS

PDF

102.7 KB Created: 2021-07-20 14:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fd79918cfc2544cc90bae3d5b3901313 SHA-1: df2bcd6b8891f1fb4b49a51b4b3a1b91777959fd SHA-256: 41c8a943b34197c0d10520194dc266c28b3aff89d09d071232ee49e8ef3284b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including those on disposable hosting, suggests an attempt to obscure the ultimate destination or distribute malware through various compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 6

  • 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.
  • 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://apoiotelecom.com/imagens/img_fckeditor/file/78188819309.pdf In PDF document text
    • http://meble-tk.pl/userfiles/file/xokonasubapebilubexidepox.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/eea01fa6e1104056b57ef823c16612f1/rimavejoxelikelaka.pdfIn PDF document text
    • https://bestwaynepaltrek.com/ckfinder/userfiles/files/rotojujapotadarafunivub.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607693087e065---30005025962.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/29134663351.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083f09b92a3d---89386162144.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e59390e98ae---25586107460.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/butepitabalamarifogibo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/lia9nimh27tkra3c465gjijg75/63518660470.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/90373572064.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/46596949910.pdfIn PDF document text
    • http://mospolytech.ru/storage//files/34318594348.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/zezapoma.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160826ddc3efb4---xupubexarawotinifuxofo.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/pagoponaligakigamor.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/medozevijavot.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c53de107a9---21476398405.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/lnovu9i8hsqbt7rb03qk43cgmc/14128598323.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/bibibokudesosebovonul.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/7254090359.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77713034363.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/e7ee5a9f644ada9e8a4ba1455268e445/rixobaxofupe.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/37976274158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=tramadol+50mg+how+long+does+it+take+to+workPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11620 11092 bytes
SHA-256: 0abe5c070ad67e9349fc402231826228c1251ab81d609072bf8765c2e86d246e
font_01_sfnt_off00012fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB0 17796 bytes
SHA-256: 1bc295f00e517e517d3d6996c47bf7bbafa64d4e60cfd268c5459ddc4eb5632d
font_02_sfnt_off00015e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17655 16620 bytes
SHA-256: 8342227f618bd1bb0bb48cca0722d8ad3d0328bcefd5710c22ef24a32b4bb4bd