Malicious PDF — malware analysis report

Static analysis result for SHA-256 827b84867655b0ee…

MALICIOUS

PDF

83.4 KB Created: 2021-08-18 14:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3404b378dd929bbce8253b1054d55ffa SHA-1: f0fde94d9db621bc6036ba23cd265fd9feabf2ed SHA-256: 827b84867655b0eed89524e1017828be11dd0ac38a6b6660d62a69003b4feea6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to host malicious content or phishing pages. The presence of numerous URLs on disposable hosting and compromised sites indicates a campaign focused on redirecting users to potentially harmful destinations.

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844317d20e3---34989461217.pdf In PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/91de648efcc3e35c83e56c90c36d7e7e/26738353265.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2be4f26284d9fe620bff0746a83ce862/dirinijipa.pdfIn PDF document text
    • https://ebooksweb.net/files/file/90168193985.pdfIn PDF document text
    • https://everestart.com/images/stories/file/ramulodoluga.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b3fd5cd71---939904190.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/58174356007.pdfIn PDF document text
    • http://unsersohn.ch/images/file/4051138882.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2acba509---19384505751.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/39224623881.pdfIn PDF document text
    • https://birotex.rs/images/files/logokunejesixijovikeg.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/wavepalirowejenes.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/aabe79356e385f2f9344415c1f747755/71611443333.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/nebug.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/51299687869.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/84762719448.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/74720351625.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/a6ceecc3a25859844bd016960e2afece/18874396935.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/eb4ad7b1a6b1ae325b62f3b5f18c738b/76389316753.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeb834f6c8---17490010038.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610096707f3db---xusazidabesimug.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160725a6bc81f2---zededufapapazabovijazun.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/23759327332.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8d35689a2---83720683839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+i+log+into+my+arris+surfboardPDF 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_off0000e0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 17444 bytes
SHA-256: 9046d46dc0c8e5ca04876dc69e21927603789546e36f209222ecd1bf7a84fc0d
font_01_sfnt_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12684 10996 bytes
SHA-256: 6affc3e622a76b89978f18f4c511a98f1338f945ff0f4f7af0b1356e416dd98b

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