Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74fbc58afa52168…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 21:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4756ec6573205aed08a56694d9c2d70f SHA-1: 6c71a0178f4da7fd00bb4cc6d15f4eb641cae590 SHA-256: f74fbc58afa52168ec9dca9bca2c806415177b9245f69c1cff2362087f722fbb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://aquatrustfina.com/userfiles/file/patedojo.pdf In PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/miwosuwumolaj.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/74432703180.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/59e2aa488d52627aadab61104ad47dc9/namubajurunipemerap.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa72c10e20---xapajugadunanazemim.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c976e86510b---gakivesimiwedojitija.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/66414486457.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/7fda199f35a011c1e3eb65e47df4832d/dusujuviwosopedizegap.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/fesurozutezetiwuzo.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-17/20210717143752329319.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/nkakqjlofojad0k4pm9kk4gi84/monudumekud.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/80016832024.pdfIn PDF document text
    • http://uniqueaddress.in/crm/files/vajemofitozosadewasile.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/16505972851.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46949578c0---rezokesemavi.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/rubisilixojobo.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/11418482162.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/25659131807.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/fijagilavewemoga.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/85152639378.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/gurerugopevubibif.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/vefik.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec754bd14---85295926914.pdfIn PDF document text
    • http://wych123.com/upload/files/wawefifazoxoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=green+and+clean+stephen+coveyPDF 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_off0000e473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 18332 bytes
SHA-256: 31ea4d9e720a94b759bc00af22b622b22698e7dfd25f08fdc37bc88ff98cf3a3
font_01_sfnt_off00011420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11420 10736 bytes
SHA-256: ff603216c62661b9fa0f05f4882aaf0f199279492c1e5f0b9e7f111bf9a13377
font_02_sfnt_off00012ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1