Malicious PDF — malware analysis report

Static analysis result for SHA-256 e385df27051a8af5…

MALICIOUS

PDF

75.0 KB Created: 2021-09-03 08:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3770932670e4943901ea78d166028732 SHA-1: 1e6344fad5be6266f0688c4f2ddef22d087ea547 SHA-256: e385df27051a8af59a586ca129571f61daf7b1e6f46b59051f093f5d2b8ff2d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure itself suggests it's part of a larger attack chain, potentially initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=structure+of+nigerian+economy+pdf+noun PDF link annotation
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/c5c53dd923f770d30997fc20fcb55d12/ritutexefexeveje.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/13567630121.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/98c4c1cb6acfcc8e507b49b29a48119a/xeraxesezibajepipa.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/pibumakipe.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaf64ca39b---gamolusib.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612179cfb7d55---mugofokuwizubifekovefo.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/h5rjt6qic7gep9e8ad6eg1j3p9/68732319.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a60b088813369d6baa1958a178f3f5ed/firizoma.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210818003524.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/xevupifiziwobeposi.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/kobukizokaku.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ki93j8q7u0hbdfqrvq0hgbsu80/8555797549.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/29772580732.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e2b46e279---vovelubevojokekobenixuta.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/8598115124.pdfIn PDF document text
    • http://tajilin.com/upload/files/tepeluzum.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/mimafojis.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/xibunuzo.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/aqdt3uo9hqk60i7eum6h7q5vve/56750028192.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/84529825253.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ef7b8e892---befisemonodisijizopeminir.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/74870338541.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd53495a2e---11779209367.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/84916794514.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/6a425562165abcec98d22c3e36a0986e/dakageg.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_off0000bfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 17312 bytes
SHA-256: ee810a0950e80d363f7cab3936ec3d4356b9cef0f10e32c974c2c4ec17431e8d
font_02_sfnt_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 11040 bytes
SHA-256: 199610fefcd3fa35250dffe96d418212ac933da70f654ec6a80160ce4e1434eb