Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81de149bb5ee598…

MALICIOUS

PDF

93.9 KB Created: 2021-07-28 01:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 364257d8913c8100280d4ab1741d9831 SHA-1: 14ae7ab1af6a71d586548580fde7ae851b154596 SHA-256: c81de149bb5ee5988878bba1dd31333c54e7c9e6a33e5f535517cdfebc3420f3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute malware or conduct phishing by luring users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://karat-dobremiasto.pl/userfiles/file/79615958324.pdf In PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/faoh7o71h7s4e8r715f74iugkv/zomitinutoz.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/64659542438.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/figurimamujekurija.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e20726158---kapavaremowojupefanino.pdfIn PDF document text
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/xudavogovuzoj.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/255f5c09c86f0c391f254c1e6c6f83e8/sabij.pdfIn PDF document text
    • https://menu2uplus.com/images/file/51548445348.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/bosavoduzesuz.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d1b88b77---9855363413.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/97142793951.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/0s0ulaup3dum587bbcefcooqs0/94141562470.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/51bb091a2458fa2e3e0b7421d6045a07/sukajijaletu.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/c8h9h8urlcs6urki0jek2okune/situmegeku.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/kevajagamidok.pdfIn PDF document text
    • http://birminghamseaholmclass63.com/clients/75362/File/kimotizotozibewalaxofovi.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/lajarefupe.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63197c97c8---56028264095.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/lipobofobozuziv.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/d31d4fdc6998647ec075bd7582159653/walawiwazesonifan.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5efd72b2e3---tetonezezatiwulopipine.pdfIn PDF document text
    • https://network-italia.it/file/gogov.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/b48f773ab42474255e67ed14a79140ee/jigudevagisefirad.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84238217545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=fallout+shelter+perfect+vault+layoutPDF 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_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 18820 bytes
SHA-256: 0459085d82485d1b3fb912669d6517e0353523f0df18fbea8e94afe4141dfc0c
font_01_sfnt_off00013847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001505e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1505E 10636 bytes
SHA-256: b32effe7d486345b4ea27531f8e1e1cbf2206bfd83bb3fc8f43b227eb5c5e2ec

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