Malicious PDF — malware analysis report

Static analysis result for SHA-256 839874a5e591d633…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 19:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 480bad4912a3b647e19b9a601ed535c0 SHA-1: 5513c55c8088c4de6be9146c9baa8bdeaa1e8117 SHA-256: 839874a5e591d633754dd71a88efeab2318a9dbe9d5de6df7769ba59dc5a79e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the final destination. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to redirect users to malicious sites for phishing or further payload delivery.

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 http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/28697662440.pdf In PDF document text
    • http://retailcop.ca/files/45813161637.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/jofevajobimojaxuxet.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1614291a51abb9---60965755329.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce6d06ae7d---93136002175.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/87601029317.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146d14da594c---zozuxuxikenadate.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/80638492490.pdfIn PDF document text
    • https://asken.as/bilder/file/48730569649.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/kegetakeburenet.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/gimabejajowuwuxap.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/balutero.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/sesimeliwenolevugali.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/96288388716.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/dikevexaligo.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/68389156873.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/sosakomuzonoxunepag.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/ridegasunas.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/5845778984.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/pejifasodat.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/8477505337.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/zifaded.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+world%27s+first+most+popular+react+ui+frameworkPDF 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_off0000ae9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B4 11056 bytes
SHA-256: 2478a64cf4dd2c2fb645f6c4561aae8a0017206cfd494ac8bfae80a5a700955d
font_02_sfnt_off0000e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 15676 bytes
SHA-256: 62a7e23c224e1c309d26dc020328e9d3ae028f69323da8469d02cb404e7ff5b8