Malicious PDF — malware analysis report

Static analysis result for SHA-256 18341fde85cb4f4e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 14:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ddf7c0bda80986ef2cd94d805ca7ee2 SHA-1: f468dfefea16af1795deb61732250a0ba149d7fd SHA-256: 18341fde85cb4f4ec218521bcd36573c5248833b9d0003a0e150065dbebb6a73
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of 'invoice' and 'payment' lures further supports a phishing or scam-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://sam-global.info/files/file/69225588571.pdf In PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607027595832d---gomamitetak.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/retobuxigolabobox.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/mifolelavadufokaneze.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/257cc8813696b819c2d41beef7fd4881/50394801430.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/61461619053.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607800e5bdfa2---kituwoxuwixejonasakure.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/rular.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/womivu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c392dc3556---80319424042.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/56537180170.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cc08245e6---27910808622.pdfIn PDF document text
    • http://stroi-sistema.ru/img/46964363321.pdfIn PDF document text
    • http://safarang.com/basefile/files/9923049950.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/lenomivejejabefaxutuzikim.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6414331ad13310e6d57d24fa8e7090c4/26080805415.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/52620761057.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/pikinigegufopopiv.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc66e4ccda---13437338966.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f1a7366ed---52960511364.pdfIn PDF document text
    • http://rc-modeller.se/images/file///witedubavoxorobukew.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/359a44708177e74e112d2bbeb6732995/68021833357.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b522e3164b3---duponabiverot.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/kolojaxelis.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/bizafodex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=furniture+row+paymentPDF 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_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 18524 bytes
SHA-256: 4c13d648116f4f670769765c73a08d895578aa40f9968ed109c431ebdab53c2b
font_02_sfnt_off0001266b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266B 10476 bytes
SHA-256: cf71344db1232da74206631cdaa9ec344bcb5fa30dd15d7e79915a3fb84c157d