Malicious PDF — malware analysis report

Static analysis result for SHA-256 e385b6a2010be129…

MALICIOUS

PDF

80.7 KB Created: 2021-09-01 22:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2a384292df4d38d8b388f4c5fefb7870 SHA-1: c513c5c120c3475dcd92bd5eea369f16cd1ce356 SHA-256: e385b6a2010be12952212ea85f82c5e684d562da3a0f8450dc4f055347f412ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://philabc.ru/uplcv?utm_term=guess+my+name+quiz PDF link annotation
    • https://alquimia.in/admin/fckeditor/editorfile/verosomadesogunufuvil.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210816_8FABFA6FA9DD0565.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/jezete.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/33775687376.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bc99d781c---vazesixexegego.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d61686b01f8---pezikidazimirirosuxuliwo.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f3a12a8c2e459e656c13949bfd67300f/11781479980.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/jumusoforawejirug.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/kulaleboju.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/durajijupiwani.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/abb8c884d89140256ea4f97c3162b6da/vifenozi.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f1f49c7ce---mosenozotovokekuvo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e945b782cfbf4ef1cc0d4e97a75a969c/22367900885.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bcccafd6d---gegenorupujowulijotizol.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe3a8e74b5---51757977895.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d330aa633---mewuro.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/pubatodizulikexagapapanaz.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/zovarazimamagij.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/sakuwanoxopezikukuj.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/46af446a872f21177445c0e181cdb2d5/gidejigozimexirajuvu.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/e47ad0ec888bf070352ee9f6a6d41f2d/40278564795.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/fuvosadotuno.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/093077867d5456b810af9e38f4f02128/zulinopuje.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/40131205632.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/dagokupeseriga.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/24138872066.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/3112227385.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_off0000d75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 10364 bytes
SHA-256: 47331e5d9b7a27bc1fc777ccf293ff643909f44be2228a0c1b9d58c5d56f94d5
font_02_sfnt_off000106e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E1 18140 bytes
SHA-256: cbdfb153a8d275d16b6b014655f5efe37f1c85ba5ec21d76740f409833a04938

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