Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7ae9e825fb4180…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 05:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2eac5cff2e46b961f02e27b348a63e6b SHA-1: 2729c312a5a4a834d29bdc3720939c0d5e02ac0c SHA-256: bb7ae9e825fb4180c85deff250a5b90b9c96e3083c5e9dbe04b895f33047e5f1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised websites and potentially malicious PDF files. These links are likely intended to lure users into downloading further malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=surface+area+volume+formula+sheet PDF link annotation
    • http://marine-inox.com/i/File/gobegosoboninuxomatesame.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133217a2c253---89443088338.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/12457797271.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210904192751.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/64392314991.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/mizinusenenirobimibute.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/wazidimoregovikomuli.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/62503789044.pdfIn PDF document text
    • http://jonme.net/ckupload/files/zubewotomez.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bcfaa963c---zenijevipituxuvewuzem.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/93285572899.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/zubumoziri.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/60788425391.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/60150415424.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e77d22aa4d---30016664139.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614282cdadcc4---32664303182.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/99567060210.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/mifabod.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/xonimiwekadejiwumojunise.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e4958ecbc---jefajuwafarixagolemurof.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/7178503912.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/51922148526.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_off0000adb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB8 10648 bytes
SHA-256: 525c99d7f1b1634129651ac09c4c57c966dc561238ef88579f555980463c3fc2
font_01_sfnt_off0000c632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 15168 bytes
SHA-256: a5be8b063c421758b12fe2893f055be6b9c4ff5fbcec55a85821bd1230a79757