Malicious PDF — malware analysis report

Static analysis result for SHA-256 84dc3938e5bdff98…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 02:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7fdc9adb1a36b548b79fcc143bec4f53 SHA-1: 966ac5efdf0573417d5a637e7c8a68a4346b9cbc SHA-256: 84dc3938e5bdff98aadcc1ec459327f9df0009a123f63f7e615fd6da964005e2
164 Risk Score

Malware Insights

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

The PDF document contains numerous links, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature, indicating the file likely serves as a dropper or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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 https://www.kindspring.org/inc/ckfinder/userfiles/files/kexofopezixufipuvoza.pdf In PDF document text
    • http://el-master.ru/userfiles/file/nokesez.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/47157781685.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/62347572920.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/nikoladujajomozutupez.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/navinunomap.pdfIn PDF document text
    • https://websbag.com/uploads/files/zupiwedivoxeruratowazofi.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140931937c83---10984259865.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/loxomizemibekoligafoxun.pdfIn PDF document text
    • http://p-energo.ru/content/file/jowaxoterufun.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/tatisaliwinewabapiki.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/tamip.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/2021912052572478.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/wuxifis.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f98ac2987d---94072470935.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/15982687858.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/zamefavoxitotifi.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6ac88f428---69556051986.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/jumiji.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401875efeb7---xelibonixiratikil.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/napufosonesemenapujo.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/tebejabesa.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-16/20210916081304113997.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/64451303361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=diamond+cheat+apkPDF 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_off0000dda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA1 10556 bytes
SHA-256: 9f415324335ded03e57adbccfd7b3653fc0978ccb27b961609d72190e8a7f675
font_01_sfnt_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 18068 bytes
SHA-256: 9fa103e40adf1d519d385bb8b3c94c5bd9bf7f482f396ecf9bedc85e10f93d25
font_02_sfnt_off00012443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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