Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7ff07c8878111f…

MALICIOUS

PDF

93.6 KB Created: 2021-07-26 10:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4b3955d781f519050da1a224ae892301 SHA-1: 18172a78304df1ad4f65c646ccd19a5b2877bd36 SHA-256: 4c7ff07c8878111f7de2034de991313290a24cf98502f325cb47f8ceabed1117
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs hosted on compromised or disposable domains, which is a common tactic for phishing or distributing further malware. The PDF structure and embedded URLs suggest it is likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/5c39f0862921c12da225859fb4388e90/55751699444.pdf In PDF document text
    • https://likeevent.it/writable/public/userfiles/file/88677230473.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/msi9m63j0qitafmirgjgk9l571/2652112486.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/87fe43f6f1b41c6295a5175256195fb2/jofibob.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/3f0a04fd577d45cbe405a9efb63b9e5a/97511030482.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/fewuxe.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/49676760717.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d36259a24---58870851471.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/abdbbed6dma3jd7oj6t21iktkv/71897736197.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb908d9e34---fozixopulolojiboja.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/7ab4cd6cf83c63f67dc8ff03d92f213a/lirir.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c19ec699c3b---98685652489.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f8ac697c62d---57487060081.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ab6be24f0f9---zulisopuvitibejo.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/37949326164.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/34153609004.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/48d61c87d53a210545b49f10c1493211/82346876494.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e8af5e119---gutopufuvapijo.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a39c709d4ce---busunomi.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/43264739257.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/83965380215.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/75181600802.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/653d02e718868e9c9c0668429b8bea34/zidoxojadizudulumax.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/xodiredi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=que+significa+cuando+una+mujer+se+recoge+el+peloPDF 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_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 21448 bytes
SHA-256: 0a5266cdca01c407605d9e74875407c46d48dac6a2d2594d482da30c29ca13e3
font_01_sfnt_off00013358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13358 11152 bytes
SHA-256: 681a1ba5557a40a380c94c8f3c1ceb39cdecc19905e1b3fb5d950dcc87968318
font_02_sfnt_off00014d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1