Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8f34c8cba9011c…

MALICIOUS

PDF

96.1 KB Created: 2021-07-13 18:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 873fc4e8f14775cff49f50b6c204cd4c SHA-1: 366d792609e9e38d23aa3e8e2ac21fe76a592250 SHA-256: 4d8f34c8cba9011c36648cc2947d006f18b35438764d196e9f85a03920edd04d
96 Risk Score

Malware Insights

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

The ML classifier and heuristics indicate this PDF is malicious. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 5

  • 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://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/8e5a2d7496eb7299ea11e47f7c85b1f4/88883301485.pdf In PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/mulex.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/xevigu.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d2afe3cc3---89546454262.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/60956062046.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85e774e92b---92079852913.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/wanakosazukisazuviju.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/42507606084.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cce3a87bbe---sunesegepidisofako.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///66392089944.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/8ece4a1c3fb68de47b4495df866d58c2/sadolujodun.pdfIn PDF document text
    • http://soflacops.com/clients/83266/File/ketazaxogadesigijuvag.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff36d6338---tavekobu.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce3d32cdbd---59966885482.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/78d34868940555581956fcd71190accb/60004715512.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/75748920853.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///winet.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/wisuvupos.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/galebiwofuv.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a62a9677dd5---98238983544.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/9261338790.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a23cc2c65---59993075661.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c25ff61beb8---zukovedogujisipegunes.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2153863037---9596369858.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/goduzuvotipizuluzin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fairy+tail+game+on+switchPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D9 20364 bytes
SHA-256: 5e5c57b893a0695c492495cc3fdf0853660c8bcdae1420b89a30a0dc3fbf03e0
font_02_sfnt_off00014e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E45 10856 bytes
SHA-256: 5e9985382e1f54823762fe912ed55f593c743fb638bc0e1ad5dec13e6f806c7c
font_03_sfnt_off0001672a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1672A 2240 bytes
SHA-256: ffb5e2511b4ac5f081e72184ca3777d96d99f7fab0f47e88a574e5ee6ac86d77

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