Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98a4d3831191c81…

MALICIOUS

PDF

85.2 KB Created: 2021-09-20 09:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7e46a2db0e9bdde951374c675a8bf8a SHA-1: e47e615146ab651b2e4971485770f1dc8c6f668c SHA-256: a98a4d3831191c81076991bc561c5b1eafe527b92d95d04a73a5ee1d5c9ae804
104 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The presence of urgency language in the document body, though low-signal on its own, supports the lure aspect of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://philabc.ru/uplcv?utm_term=things+to+build+in+minecraft+for+your+girlfriend PDF link annotation
    • http://acutecardio.ru/sadm_files/42071048696.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/morufasirinexavulebowul.pdfIn PDF document text
    • http://czyxchem.com/upload/files/futegubujofukeli.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613094488a956---47268820795.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422d918dfdd---78839940204.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/29764019534.pdfIn PDF document text
    • http://oilspecchem.com/files/81329762289.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/ribarojutota.pdfIn PDF document text
    • http://ctm.it/userfiles/file/97867420821.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/21567004215.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/93076102254.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/zizaf.pdfIn PDF document text
    • http://manu-transport.com/documents/file/pikeganizipilupifalola.pdfIn PDF document text
    • https://epiphanych.com/images/file/xakixap.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/22570260475.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61886958375.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/finowituxij.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/bipafivug.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/nuxekizobixatovorinitote.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/zerolafak.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145aac87e294---28468532177.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/31611519575.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/77050740869.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138f7ce4edae---69878930052.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_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 11240 bytes
SHA-256: b58333a4155313aa3a712687f045a8dc687fcf9f8e23c4be7f782f0a38a1b3e2
font_01_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 18388 bytes
SHA-256: 6eb4f429ff0487c1aa7513f4d85ec7eb7299b8d2a20615a48d5d52e78f5fad4f
font_02_sfnt_off00012e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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