Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c6a6856be46495…

MALICIOUS

PDF

119.5 KB Created: 2021-09-06 14:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d506f38c04b3a81c5cdcdb8ac39af618 SHA-1: 394b2c23729e495f2cf61995e214e97b999348bf SHA-256: 59c6a6856be46495a2643d459e4f51d42a7cc8c462ecd5b2bdf66a4efbefb24d
212 Risk Score

Malware Insights

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

This PDF document exhibits multiple indicators of malicious intent, including embedded JavaScript and a high ML classifier score. The heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting sites, likely to facilitate malware distribution. The presence of a 'Browser extension / update installation lure' heuristic strongly suggests a social engineering tactic to trick users into downloading and executing a malicious payload, disguised as a necessary update or plugin.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://beergolfers.com./blog/images/file/9460417820.pdf In PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/698f1dc2e08850e803d1ed5bb4832a17/42966941057.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902e9572ae8---funodifinomiwigemarupub.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ab5183a76---dusukigagisadiguwosanojox.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/xowinepikedokakegi.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/fisisodix.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/zotuwadevi.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/50654924028.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4e0a86045---85549272538.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161236d96224ff---3354834864.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775e410dce7---17710273197.pdfIn PDF document text
    • http://goshaggers.com/clients/2/2c/2ce39afd4341152949bc146f79210d6f/File/linilije.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7128f2473d---6029816914.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/9292493643.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muvonatu.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084e42e33a8d---ridedejigonimesozoxuvi.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/kenirudifomog.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/e814ce4e374180b447a4ca924203d824/sunedugefu.pdfIn PDF document text
    • http://medi-sen.com/files/files/58632515162.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798fac437ab---gavobopifa.pdfIn PDF document text
    • http://kasargod.net/uploads/file/68721864388.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731a7f55640---5044926149.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/cb093eac7c3e4bf8280a2925efb221e0/48116771049.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/rdgapsmo7hjq6vn05gfuvlidv7/kasajejerilinutaboxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=grocery+items+list+in+tamil+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_off0001640a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1640A 23100 bytes
SHA-256: f4bc65c9337aa675c76d398974076c4b03a9c84471338f4572b7b5b920b44eb7
font_01_sfnt_off00019e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E3D 10936 bytes
SHA-256: 2bb8589a8ad997baeb078273076cfab38b118f02209c321e1879c428cfac1045
font_02_sfnt_off0001b7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.