Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3f5a4740da602e…

MALICIOUS

PDF

84.1 KB Created: 2021-07-01 23:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b5c347e1e0c2f0207200a0baa57553bb SHA-1: 99cf3ca8dde0dbc9d111d6a4fb8c810b85360d33 SHA-256: 9e3f5a4740da602e7090ecba425272b15d133f56c1d407596eb16bfbc6219e14
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into downloading further malware or engaging in phishing activities. The presence of multiple distinct hosts and the use of UTM parameters suggest a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=converge+pdf+files+into+one PDF link annotation
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf11ede3a72---xubovuxu.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/ceec7b535cb991ef9b62ce940c167310/31943802434.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/9f08f155e6f7b2137ced75791a70ed24/15476238574.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/bugafiwigevifesuxaz.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/kijonofedezamuzofodefipe.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/sevixeradetalodifoz.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/37066871526.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fd27efb3---gozatixuponiwududuxuzi.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/32427724783.pdfIn PDF document text
    • https://sealskinz.ru/files/file/xezawiginomize.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609e66c396db6---lezavaseliwexaxut.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093317e1a806---kuxasiguboru.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/b3uurnvsuikskndao6fg8kutk4/48718481157.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608076f9851a8.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/ccu8of7ot2l7o1seldp75k2et2/lexuperasijajubopabibumox.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/68763031675.pdfIn PDF document text
    • https://masihpt1.com/contents//files/lixexibenawirususi.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/72640604879.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2b69325a9e36014e325528ef192577c4/99184070948.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/aada1d9e98888aef51bbf7b02d0eb8dc/tidilozobilefivavalof.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/kiriwugusegesoniwi.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/75086768930.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b2f25b8c6---vawujozegi.pdfIn PDF document text
    • 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_off0000e559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE559 17412 bytes
SHA-256: f474ba88bda0cb3efe5e15260ff1bf89411699b61cfbf54fb25134b9b73f48e2
font_01_sfnt_off00011305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1C 10608 bytes
SHA-256: 09cef55cfe73545302d54ee45e95b195080566079f433b2db677d5dfa3810d90