Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43b588b8ede850f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 20:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 311db369c018ae8fe37b8599bfbcefa9 SHA-1: 20088f928e058bd46417c69a4493d58bb5e74a21 SHA-256: a43b588b8ede850fa57ef9db8533ceea2d4d986e1c3f28658dcf345b3269de45
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content, which is a common tactic for phishing or malware distribution.

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://tangiahoang.vn/Images_upload/files/jopuroforunesodemuv.pdf In PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c1e28570---10134086904.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/gituwogabosov.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/19767210658.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210904_121149.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/sunedebesakigibofo.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/0um2je5a5j61a5e9hb0avqgigq/63570699100.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/fodisubaribofamutufi.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff0eb4d844---bisuwaronasavelowinepod.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132226fe529f---xadakiwuvavaxezoviza.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/tupejetovubojinoxosozusi.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/maxofogumukuzekogozijig.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fisakigenokizokizoxeguvo.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/tumuvotevagugobosupu.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/20334706970.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/40379623319.pdfIn PDF document text
    • https://cmoretv.com/userfiles/39217664479.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/77296078251.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/merizukijosoxalup.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326aaeb324c---zaluwemukipibuniwamezagof.pdfIn PDF document text
    • http://dolonchem.com/upload/files/27268481650.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/71ea993b8e013ca9381ab8366e0fd4f3/40663686244.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/61515947178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=copy+paste+blank+characterPDF 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_off0000ce8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8B 10756 bytes
SHA-256: 98cfa4a08a608aeac82c1a98cec12f093d2aab40c973482cec8922f4a929008a
font_01_sfnt_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 18844 bytes
SHA-256: fada0132eef3cd92055ec4a176e8f48f265c62ebf492a9d7676c015684096ab5
font_02_sfnt_off000118a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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