Malicious PDF — malware analysis report

Static analysis result for SHA-256 384c46d7955d741e…

MALICIOUS

PDF

85.4 KB Created: 2021-09-16 18:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b043574603e4a053428bc68dc372320 SHA-1: ab8f1535531f16c248a334ebe646d584d663e02d SHA-256: 384c46d7955d741e95f44f98f8f7e1a2214f08c624f6014cab1b4db5d48fe4ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and utilizing UTM parameters, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=how+to+create+a+new+folder+in+android+phone PDF link annotation
    • https://dienhoanghean.com/upload/ck/files/xikanovivu.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/lovafavimirepibekafaguta.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/dokapirowifofekojawi.pdfIn PDF document text
    • http://www.puskinas.lt/ckfinder/userfiles/files/48443602479.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/lasamajezobavizi.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/64582309048.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/64939796964.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/nanubupedajojowonawep.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/buwukisibuxetiwik.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/kimomozujuwewuteferona.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/fotadabuzefifame.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/82033407893.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345523c6e9a---diribipamawitumikuputul.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/tatizasuvekamuw.pdfIn PDF document text
    • http://machulski.com/public/file/gufofeterilatituro.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/0991661ad97d6aebd41b33dc1a0b2da2/64756283903.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/58063882014.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/bodewiworijakerixokel.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/31175314846.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/jukavezigiwedagibapap.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/72005562220.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/115444a8c63d5cda761ee520cfde3d1c/zozigugapezopida.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba69635be---vesezu.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_off0000e926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 10624 bytes
SHA-256: 89918de980615d8f31efd076e6e82865dc5c850069efe08aed201267d4ba050a
font_01_sfnt_off00010157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11969 17620 bytes
SHA-256: 3f39c03aeb739e9f3928c3757b5fb1d7218db72796d3038f6f25e9956c7a6635