Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3f0ec1ccaff975…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 02:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: edbb01d423ec7cd43dcd324eba601cad SHA-1: 036742c6e9346873ec79bf3a82b3c766eb580394 SHA-256: 4d3f0ec1ccaff975549bb2f80cd5c812054ecb346107da152f24769f34c4a247
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. ClamAV detection and ML classification strongly indicate malicious intent. The presence of multiple external URIs and link farms points towards a tactic of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=softmod+wii+u PDF link annotation
    • https://protradingindia.net/userfiles/file/11255315468.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/sidineninapadomipupabez.pdfIn PDF document text
    • http://workontext.ru/media/file/59456253244.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210909105615.pdfIn PDF document text
    • http://domexpo.ru/up/file/87178490166.pdfIn PDF document text
    • https://wittnebel.dk/file/90033957620.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138edc1df570---tikigem.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/56139731626.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/92115390065.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a89c06992c---rakanadivefusavajeb.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142549e94cb4---fawusijofavafemibanewo.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/40765157900.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/jaraguvefezowemagibu.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613737186c2bb---28006514779.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/4046564029.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/jilesumopupabizuloxo.pdfIn PDF document text
    • http://nineslash.com/user_file/file/2332860515.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/lifinubewuninipi.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/2993085915.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/vinesugeviruvibitubuzuge.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7qthi8egbtoeda030fsu9918p1/pamasekokak.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fa517b40f---64429446810.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/24113449155.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/8p2d1bjncvacublu8iaqljuph3/30585183080.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_off0000e6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DE 10064 bytes
SHA-256: 200891f66a4e4789a08514e4eab6e28f06450afae25be19c407b1af039ee7ddb
font_01_sfnt_off0000fd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 17784 bytes
SHA-256: 6e50094a30a1ad9e312c99893e6e46c22e0d7f110545764efcb275898974ff0b
font_02_sfnt_off00012bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1