Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be716a439d9d7a1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 13:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3b3b76d71cf7a46cbeceaab16ff4f0b7 SHA-1: 9628139f436f20542ab488f46bd1c48d6396fb98 SHA-256: 6be716a439d9d7a190c3776d7bd7dd4830b2dd7b5035c81e2e72d3315f17ae07
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to host and distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ce65e46c1---tunuwurosiket.pdf In PDF document text
    • https://avenue102.com/uploads/file/lorosaxuserubefumaj.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/vulibirixaresaloxuj.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/nipenufagasedopefudotiged.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/neputuvafan.pdfIn PDF document text
    • http://land89.com/ckupload/files/muxelil.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/wukutolizew.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/77908231435.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/66822974894.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/6248301179.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/ee60ebd2135a31d756a115bdd9539cbd/wobivesejoko.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/vawunod.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070231a84375---rijobafonekivosux.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/feburitideveraxasa.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021080108355189.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210620044810_848436681.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/30668887845.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/50304696911.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/solovizepimawininom.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/vaxisezobixewa.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/24769384733.pdfIn PDF document text
    • http://regmac.net/userfiles/files/78518836909.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/7c01710344fa2e1b5f749ff3d25f9cc5/46958989568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=function+of+trade+union+in+malaysia+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_off0000d418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD418 17468 bytes
SHA-256: 23a18f02caac0c737c99c2664ffc889848983b79f01582a04f92af42fdc926d3
font_01_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 10972 bytes
SHA-256: 96f4a81ef670b7647eebce711b13505a80090304b274706ac10df8e404b6c8c9
font_02_sfnt_off00011a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1