Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec088f19745e3062…

MALICIOUS

PDF

71.0 KB Created: 2021-09-01 09:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bfe7967525d6336372fd6db32f52b21e SHA-1: c72ab3db352dee597ce434b84788105fda378636 SHA-256: ec088f19745e3062ce6132c996c91432b8485a1c5400907478cab51b2bdfbedd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous URLs that point to compromised websites and disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution, leveraging the 'Spearphishing Attachment' technique. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=i+feel+like+a+monster+song+mp3+download PDF link annotation
    • http://hkt-optics.com/hkt/images/userfiles/file/56764757054.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/tigoroganizikavalaxoj.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ijkaelqk4p56h69s33h4fmlk42/13009918507.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/2678283120.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/aea69d09f28a752034fdc9a182aa3f0a/24644626921.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb178d295---jonixodila.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/nusuzupesimixuri.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/29229590051.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910d8eeaf1b---86804772711.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/surimamilojogirepitiriza.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/89118815479.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/91d4067006ca822d9350abfee1c08338/44539396688.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/d6abc1c5589a77a8a5a848a9fddbaa40/25124745753.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/vexuk.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c97c732967e---vodixipinapow.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/kodumuzegajivi.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/13521477347.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/n5qd33vb82lq0ff0j0dr45h4i0/7408447208.pdfIn PDF document text
    • https://grandegroup.net/files/16703057761.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/79382262370.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/kuxoranavemodikafafegaje.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af809e827c0---wujulutetetejisodufito.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/iaa12tpjsc5bjm5b4lpfs62j44/tiverir.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_off0000b475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC87 15696 bytes
SHA-256: 7de9dabc3fc02c5ebc746a169c5e365a6f2213cd01e975cf7a219e8ca6b88a87
font_02_sfnt_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 11144 bytes
SHA-256: ac7f289d4eaf8e4af1961484e5f17db9368fbc609dcec2cab6d35ec336211a6b