Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3381cd6d26819a…

MALICIOUS

PDF

98.1 KB Created: 2021-09-16 23:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 38ec1335fc47be327ae457a1b8cdaa5c SHA-1: c0363a04069f576050a96ce386221725a7852ce0 SHA-256: ed3381cd6d26819ae9ad49b3d7eebc1a1ece135c57fdddf1d8d24a904c68b200
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Additionally, heuristics indicate the presence of a link farm pointing to compromised websites, suggesting an attempt to redirect users to phishing or malware distribution sites. The ClamAV detection further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 http://sevvalturizm.com/rsm/files/jifavot.pdf In PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/bupaxoniruxedokeniva.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/12886924264.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613389921f5e2---59726195088.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/kuruzojurazaxeledav.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/16690706627.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/47199176745.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/0e9a3ef4f4bc0f7a8625a955058b056b/kukikekarawenalogimetik.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/97006111073.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/46788450086.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/55992739670.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/tujabokikonifuzagumaro.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/8777380035.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/21199329684.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/jezukif.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613304192e68a---99198599375.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/55006170154.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/verotu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161403847a2f04---35855986544.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f625f7c706---zeziratojojojo.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/noromenatabafiguvob.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/52400fb0d65f6d5909051a89f8e296b9/16872995437.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/34302495875.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613562bd762a4---gedinoponuxiropi.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135da5c76d70---nejesepejenofotojo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133e5098c0d0---13165206394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=watch+paul+vs+mayweatherPDF 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_off00011785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11785 10680 bytes
SHA-256: 1b7ed5c5841fa7d8b871aa810424cf57e0ee96ebf8e05bb03b920e3a397f4ee0
font_01_sfnt_off0001302a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302A 19396 bytes
SHA-256: 3d142cc8ff30a9091b5a6c103b7953a1c50adc5317727c8851ac4a3f0105b80c
font_02_sfnt_off00016302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1