Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79eff57715d8151…

MALICIOUS

PDF

77.5 KB Created: 2021-10-11 23:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5bff7184f7ae2fb07528a72a35a35db7 SHA-1: 3377f0338f0cf6050b15c4dc31ab102ec8c1dea7 SHA-256: c79eff57715d8151e0242b8687bb538937810f87349ca8a9462bf162d691b7dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, directing users to various domains, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://gloteckr.com/upload/editor/file/gufuno.pdf In PDF document text
    • http://atdawnwelift.com/userfiles/file/zemafuviwuriliwukigaku.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/xajobulofozuwavibexolapap.pdfIn PDF document text
    • http://mopron.ru/upload/files/3232501176.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/56255176065.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/korironekowogoxajapope.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/zusakadigapasa.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a2a62adc8b34fc8fdd610ca8de4583a5/zavezibafo.pdfIn PDF document text
    • https://kar360.com/resimler/files/lokunivebamuduvefebox.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/12776976077.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/14150231317.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/gadiviwemegugujonilipuvu.pdfIn PDF document text
    • http://potlista.com/file/files/74777434182.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/lojasejejosurosel.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161495d89b2665---40594259571.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/sejef.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/28787889821.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/5005047830.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/57e68temov8d8fjqrj4gupgbj4/kuzomifik.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/sinixerulubojutapatim.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/xenobut.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/bojoru.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/35321366635.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/tugizoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/tgwjJlsMqHc/uplcv?utm_term=nursing+dosage+calculation+practice+worksheets+with+answers+pdfPDF 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_off0000c6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E1 17912 bytes
SHA-256: d867779d64c5d8ab470ce94ef0c265e1ee435219e48e97bd59d9b95d54ef1d9e
font_01_sfnt_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD2 11152 bytes
SHA-256: bb52eb561fa91c1b0441b13f620f26e18e4b2440e87f2beba3a637261b55c863

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