Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bec8659b94cd029…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 23:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e2ae47c4f89ac12638ea0245a4630c32 SHA-1: 097d3b081b1222eb50e1b4977b425d0319a13a18 SHA-256: 1bec8659b94cd0297e16d50e85d07ce18981247db529148a44b4b76553c13841
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The heuristics indicate the PDF acts as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute phishing content or malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tktravelkorea.com/FileData/ckfinder/files/20210818_02D6BEE47DA32937.pdf In PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3354d888c---15882590683.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/2723ad22e4e97dbd5eedc5f320711307/mexagav.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ef6ec698e---58273806705.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/39553135788.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202108131605297858.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a64472f1eb---guxuri.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608227e0e8936---13816476468.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105c513ba566---samazivexogodif.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/8fcfd99ee85015907f576cf3a0525583/45398361720.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/ripozavuzavadetusiwada.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160916bfab3707---57157682444.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/mowapekanitavumejutukuxeg.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d71196fc6---64573084694.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/sopaza.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0297337001619775180.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/8ba620e68323b7287a3eb66dffd9b682/tatagenojukufewaxurenejef.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/t2iuumlh4jm5nlgcjm4nirbs7t/zakimubumuj.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/eiogn8doh5ubea20u11tehjuc4/54755432910.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/47251270545.pdfIn PDF document text
    • https://irrisyst.eu/files/file/tereme.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/74820077215.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-4/20210604235300346019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=crime+prevention+theories+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_off0000e6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE3 10652 bytes
SHA-256: e3a2abc8da42a4c3981ae3df5a517d647337bace2134499d595d7749620ebdf8
font_02_sfnt_off00011712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 17176 bytes
SHA-256: 41a6bf983017671221112e79239c8f74bc50bf8a1147622be540f223889bf009