Malicious PDF — malware analysis report

Static analysis result for SHA-256 059b2ef35c48abd2…

MALICIOUS

PDF

99.7 KB Created: 2021-07-21 09:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 66dd08ac62826f487dd20b03fcd8224b SHA-1: 20002ac54b966e942707ceab0d3ed46709cb221a SHA-256: 059b2ef35c48abd2656c83ae8eaf48579c933df2375ca98062474d06b548efd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yogaschoolofkerala.com/photos/editor/files/polikogor.pdf In PDF document text
    • https://binarbaid.com/public_html/userfiles/file/gilal.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/3379050400.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/kugokuxike.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e60a264f81---fizugugatinubeni.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/lunire.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8a7dff1ef0ad47c935d0eb6eff35ce99/52061438944.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/74872006151.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/d3bee6d225d23c0a2abc1bfc22e281f6/rorazetixawazoxawapo.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/hr0h5m0qen5f2h9f97gcmgns0o/66518455358.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/bigoxeworilekane.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/el744ocal795nruiqk9mnakto2/5341554717.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/47826066658.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/58083803009.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/nuxifowefuj.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/35502738994.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/34vcqct34b7lmr9p4r1avdb8gr/fevanesigedilanatuba.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160803afc5c778---tidafozeled.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/98354445551.pdfIn PDF document text
    • http://siembra.me/uploads/files/nigetemelos.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffd8681ee2---lejidekesetewofi.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/lalarikofob.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160bc92db25cfc---xonemitevomagatukodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sponsoring+an+immigrantPDF 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_off000122c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD8 17952 bytes
SHA-256: 2b009001fcf8f383507814e31a41d3bf7e9192f26ef072816b4e86ac4e90b083
font_02_sfnt_off00016a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A26 10492 bytes
SHA-256: 0861d0a2dba7a2d0416f72bd8c93afe29768389865edf250153aab04c34ccc23