Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16dc3dc7abaecbf…

MALICIOUS

PDF

98.9 KB Created: 2021-08-29 02:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 25e1320c2c261a1c25f3afaa298557a1 SHA-1: 620ba2ecbdea152594e14705050a91a095c61ce6 SHA-256: a16dc3dc7abaecbf86f3394b66c690a50f7a8ea170264c79824a775accab9168
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123c63e96117---lotetabotewejinaf.pdf, are key indicators of the attack's redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/6cdece1196bc5e4eb4899665209c90ed/wuzerem.pdf In PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8f3066b29---31082933996.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca5cf97bf8---25070387600.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/monugotowage.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/mibilija.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210704_C5FFC34AA7B84B76.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/ab81064ffe21b624ebfce0a75780897b/14387553825.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123c63e96117---lotetabotewejinaf.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xejoleropujiboziwusuzuxe.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/wifebuzawiwoxakegu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a8ee5fd77---89030195632.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/bibum.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/67bfc62b24a4dcbbb00f2514de6ca748/51742449976.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/xozimefalununagawugazer.pdfIn PDF document text
    • http://stattus.com/assets/file/18534334562.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/lewesa.pdfIn PDF document text
    • https://wrd13.com/force/file/tefexitupajuwoxugozugefet.pdfIn PDF document text
    • https://blv.by/upload/editor/files/xofotizogigibedosanaf.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zarolamo.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051905451673499.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/73947065539.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/21a43e8d162e8fed8e8ebcb4890c79e0/26315103367.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/7bad4a7bf59432178c0d417717ef6b74/82427255164.pdfIn PDF document text
    • http://4darchitecture.org/img/all/72265956840.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/26853172290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=surely+you+must+be+the+son+of+godPDF 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_off00011bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFB 10976 bytes
SHA-256: 862dc06acbd8f7b8bfa1dd066b13f6b266fc1678907e5ddaa099afa7da520880
font_01_sfnt_off00013520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D32 18300 bytes
SHA-256: 7d744424cd830f3652cfda257c47eeb1557ab0d04ead873d0c36e6f3b886c440

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