Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5ab61a85773251…

MALICIOUS

PDF

86.3 KB Created: 2021-06-28 00:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 623ca550731696a2981357ff9440eb2b SHA-1: 331b42dccf889ad85a672e7761676773e68b8d08 SHA-256: 8d5ab61a8577325107b1e42f5501d1ddb0cc76c4019781075bc1523f0c23da26
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs that point to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malicious intent. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f17ddc754a5b5093150b6ca7e182ca59/jerorixida.pdf In PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/7c35c93e965006f61941ece310d36c04/fupanuzagiponelabifixaj.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/802bff8e2fef707e62406fd06960ad7e/lupokinumokufire.pdfIn PDF document text
    • https://abeess.com/userfiles/file/femabefomalamab.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fe4d4a376---zelem.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/oamg9pen8hurc3ve6hki3m3mi0/rufetefakejezebo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608deaa18827c---mipuderumerewazutubegozi.pdfIn PDF document text
    • http://vce34.ru/attachments/file/zezasilidor.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/sivuresiwononupoku.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2df3306ab---91067654691.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa08c1406da---51675618941.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/omkioedqcgpcha4ailma8ble84/juwivit.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/abf84b9d006c82d120b49873937d90ff/48895845341.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/wiliduvurenosas.pdfIn PDF document text
    • https://pathakpharma.in/singhania/downloads/file/96558556135.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/56849116983.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/ramubagodamilatedi.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c5a48a116aa9413480fa6454b0ac34f9/kigowaxinugisudebejepixa.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/venaxevibiri.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b350e2ef037---bodafotebatimuwub.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/pixupasikule.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca24c8f254---26474793222.pdfIn PDF document text
    • http://www.asslar.de/downloads/30899869950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=apa+referencing+guide+2020PDF 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_off0000eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 17164 bytes
SHA-256: 37efc19e988fa36e3033875ba52747f5972ef13e2e934d2c9c8128534935e500
font_01_sfnt_off00011ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BB 10688 bytes
SHA-256: e7b1c0e54960ee21d948d75c1e30257a5ddadf62e224f7a588680e913c203c53