Malicious PDF — malware analysis report

Static analysis result for SHA-256 367a03ecc5f79c85…

MALICIOUS

PDF

78.0 KB Created: 2021-09-12 18:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed3b440193509afb68f6a804e67df1b2 SHA-1: d91ae26231e02dea9f805da12a683026bb16819c SHA-256: 367a03ecc5f79c85a62306b07d22748f46b0b5bbba54ffbfa043fc29f2de12d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, some pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious sites for phishing or malware delivery. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136586325188---88426012760.pdf In PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/39314342792.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/xogupipomekogaxubapifavu.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/gixulosali.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/56330016592.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/xotijabapujezowawiwanib.pdfIn PDF document text
    • http://strahyi.ru/images/file/55676488188.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf50961917---wexonaditiberimoped.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/57394285306.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/parelure.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/90297542481.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/10461446895.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/lotibugu.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/pawebomolapa.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/vorumiwurude.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/3ee1d8987839e6dc582b0715397f05e3/minoxirox.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/238fae77e8868f6cbb38e9c6bf5ed491/gokavuwamusewawoti.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/49994171408.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84442303243.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130ebc62b2f2---vulotunizug.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/difakotep.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/bowulegixefewavuziwanezis.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/vesovejefava.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-4/20210904124742221808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ios+icloud+bypass+toolPDF 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_off0000cd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 17712 bytes
SHA-256: 61364ba98ff86abf629b5971275d3898fb090ec958fec8722024cfbb18a71281
font_02_sfnt_off000112cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CB 10476 bytes
SHA-256: 1a23b2699dc2790b0f06b72ea312018180a5299b6097f7e3b344bf7f808d02c0