Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d07b28d6051db04…

MALICIOUS

PDF

105.7 KB Created: 2021-09-10 11:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cac1d92967c056470ab0935a07a60acc SHA-1: 5c551832463348b530a2cbb0cc207a64c28165c5 SHA-256: 8d07b28d6051db043c9b8c5ad326a77b165421c96a188a06a43e24176833d628
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics points to a tactic of luring users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=ps4+emulator+play+store PDF link annotation
    • http://dges.in/userfiles/file/gexafiwemevomudirewoxovem.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/29789270043.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/89106472722.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/pomosejizidibedojeragiri.pdfIn PDF document text
    • http://djapm.com/userfiles/file/kibuworabol.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/37228710165.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/2885654518.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/xipuvumadusum.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/66242127253.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/63004214907.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/af6d0db752127a152fcae5f15c46b012/mibumofofukiwelefepubi.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/xifurabotodugoduxosina.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/32165816910.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/d5c9a7af12e8aede0d9859fd8f1ec294/72766955455.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/wurakawobonibejifo.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b106d9e931---rafufetopuvojokopevejuxuv.pdfIn PDF document text
    • https://profesa.net/userFilesfile/70793868664.pdfIn PDF document text
    • http://metapolar.hu/tmp/mejorumovesu.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161338bce3fe45---lonatujidukijagopagi.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/86479087396.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/cc3a96af0837d0ce950e46999f6ee07f/ximiw.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/67450300164.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/36582486981.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000137cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CF 19080 bytes
SHA-256: 28020df7f902c3408b42768a36ab8a684d2a6f73f25627d7c5a6a5f284ec9895
font_01_sfnt_off000168da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168DA 10508 bytes
SHA-256: e0b6eb5230d97d61ee46457bd82a8abad8963fc2ca975eb0eb09b2e28b467b8c
font_02_sfnt_off000180f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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