Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b912c51ff98104f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 03:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c3122f4b1f14532529093f1822fc0231 SHA-1: 7b0fdcdf50823f2ee7aae3ecc459ed8502e2ecd2 SHA-256: 4b912c51ff98104f455169a89116feea022b398c5bdf8b54fe5aef41c36dc336
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a phishing lure, impersonating a cloud document to entice users to click on embedded links. The presence of multiple links pointing to compromised CMS uploads and disposable hosting, combined with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. The document likely serves to redirect users to malicious sites for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6fabe886204b4dd0a305edcb85ae979c/39829933871.pdf In PDF document text
    • https://akamercedes.com/images/uploads/files/16224479712.pdfIn PDF document text
    • http://halanmilk.com/upload/files/74916569765.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/15477692455.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/166551274.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/84552114738.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a829d4a095---22481963861.pdfIn PDF document text
    • https://adikkedua.com/contents/files/nopirowopakijebevanifu.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/81167443088.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/nukifobefopal.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/ab6d381529dc1e4c942e37e4631ed749/welelugokagumezowu.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/26768829634.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/6902309176.pdfIn PDF document text
    • http://learningkey.org/userfiles/roronolasuxawusu.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/semepapedozomegatabo.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/87174111101.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/76756677392.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/70s1l7q0eg66hg8t5m6bhurejk/digele.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/39079060809.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/timesub.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/16759015624.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/dc988abda3a8f3f37b79f69d213176c7/wugobunitus.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/tutodijasugagaraxorozama.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/71078261456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=transfer+files+from+phone+to+chromebookPDF 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_off0000e148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 10940 bytes
SHA-256: 11086eda0fdc38db9a3a6e65d42c3a79fda928fc555bcd80ea21136f86c371b8
font_01_sfnt_off0000fa39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001124b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 18848 bytes
SHA-256: 2153924c378d3ad589ebcd6001990d7e73ac2bc0040b25df27d7d294c232f200

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