Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4cfc3c2f50437b7…

MALICIOUS

PDF

85.5 KB Created: 2021-09-04 06:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 57c4759498cfb6cd73d6df0ebf20f6eb SHA-1: 34fd08bf27104274a6e4f5e5883a5f783e85b522 SHA-256: c4cfc3c2f50437b7af1e7ca3642344fda3fc18c673ac49e9ad6dc36019964527
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a lure for a browser extension or update installation, a common social-engineering tactic. It also functions as a link farm, directing users to various PDF files hosted on potentially compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing payload or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hanmih.com/userfiles/file/20210721220931.pdf In PDF document text
    • https://contemporaryteas.in/admin/uploads/file/julexababafosi.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6332a4d27a84b79c7e9d89ac1f04b0c2/tejidetow.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/7c9b6be4c372e46d045fcb8d294df40d/xuxem.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/rebipajub.pdfIn PDF document text
    • http://klhl.com/userfiles/file/voxajaxutadiporemid.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/jawonow.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/36731281639.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/gizizanafegetaji.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/74526889587.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84fb8bed36---45890375938.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/dixonapuginomomebi.pdfIn PDF document text
    • http://simoncaulkin.com/images/xigagofezeserazefinivu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082edca0cb70---gumewipak.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6ed38537e---80794416450.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/gevefojexib.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/mifibejufitof.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/legosukobapin.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec96a304d3b---15291426109.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/ek4dtii75rgi1ggl73go59gjb3/zewolavejekemojemuri.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b847fdc318a---fagujodokezixewowesa.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a823f0c5b---68634279272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ies+general+studies+handwritten+notes+pdf+free+downloadPDF 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_off0000e7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBE 17276 bytes
SHA-256: 5ac6cfaae7d00e6c6531e336c43996e4af95714f9303f42362d1daaeca658058
font_02_sfnt_off00012c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C98 10912 bytes
SHA-256: 87fee93f823cd75788131da39f13c2a0a454775783f7d154d471db02fa18f61b

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