Malicious PDF — malware analysis report

Static analysis result for SHA-256 568458df87405975…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 08:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fa962573840c664632473a9f8575bc00 SHA-1: 51cc5af5622ca04694134eae00e4691521af7db8 SHA-256: 568458df8740597523c8b240576b42c79eb09f8fbfc939114679b23551f5e227
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, potentially for phishing or malware delivery, as suggested by the 'link farm' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=my+talking+tom+1.0+apk PDF link annotation
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/fasufekituba.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/28924130196.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/pipipedud.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/nonidib.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/923dee98ca69fcf324e9b9ae992c3bab/venumejufabuvirum.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439828da658---86625704831.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/difaxelivekizobedo.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/52896597533.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/37067274743.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/3218915579.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161398f1396df8---65619530149.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/tawudoterabubakizalu.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/zizakomisos.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/kawivis.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/pofepuzebozodat.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/pomupakifobolonezafize.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b8a9a7c96---vutaguga.pdfIn PDF document text
    • http://wwstationery.com/files/file/todiniresulokijonepomodo.pdfIn PDF document text
    • http://nensi.si/upload/file/bejavorodulelotewogamon.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141e6fcdc3b5---lopimoseleropuwetagapebo.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/77428779306.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/runiletigotug.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mumumIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/maxexawizewebit.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/16256658889.pdfIn PDF document text
    • 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_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 10632 bytes
SHA-256: c88894cd43117ecc154a911402ef2bfa700f40fb2148f64e52550db9f4806256
font_02_sfnt_off00010f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F62 20452 bytes
SHA-256: 28a4a7d4331d9b9ff4881a78159da10fa9e4d0cff6afa29d8779987565d5894a

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