Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3433c1342e6c6a7…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 15:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: e9e54d6214b00c0554b67e5733e71781 SHA-1: 009af82940c9542affdbafd37318c77b731b09dc SHA-256: c3433c1342e6c6a78dc9b1e1dd8e5b124756c1acc90719f1fb44af4171d5eab8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and is identified as a link farm hosted on compromised WordPress sites. The embedded JavaScript likely serves to redirect users to malicious URLs, and the link farm structure further supports the intent to drive traffic to potentially harmful content. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/12814e3387e68a585b68655ce6f8afde/44712627097.pdf In PDF document text
    • http://garage-fuji.jp/js/upload/files/54773786957.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/57414047823.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/nonumobaku.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/18410823570.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/60959029833.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/72507152378.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/ffd579341cdd0393405636ce480dec17/20269864529.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132ecf45b33b---wusubajijan.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/jefixuratodomimunowerel.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/79688572316.pdfIn PDF document text
    • http://15881588.com/ckupload/files/nutibugewapemevigumi.pdfIn PDF document text
    • http://wmsone.com/eimages/file/46370953047.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///lusewufajixibilopisixox.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/sozajerorul.pdfIn PDF document text
    • http://bndweb.nl/upload/files/69165932428.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/xufubora.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/25376813142.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb333a1f84---51371675126.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/kogapazoxomurumufuze.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/76670964162.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/luwumebetafujibizokede.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/dowawixujomemog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=make+dual+boot+windows+10+and+ubuntuPDF 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_off0000e3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 17748 bytes
SHA-256: 36fc3fc551d60d989c28763782166f17b79de703594d275b5423827ff527e21f
font_01_sfnt_off00011140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12957 10728 bytes
SHA-256: 32788f0e4dd6e10825ab675b1b159907f673b685d93a16290f65cd3855a91c2f