Malicious PDF — malware analysis report

Static analysis result for SHA-256 816bbb813b0c26ee…

MALICIOUS

PDF

85.4 KB Created: 2021-06-27 05:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 17c4368cdab35b938e231f876067555a SHA-1: 204dc60b3d3241a35318668b669be6b111ab6843 SHA-256: 816bbb813b0c26ee704ccc645864a0bc6fe5b2fcb65cbc5cb22d1c24facf66dd
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the presence of link farms on potentially compromised infrastructure suggests an attempt to distribute further malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a common distribution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2a5ae578aa801a31d1658f2558b091f8/gumetulowosepoxudemu.pdf In PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/41159282234.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/xuwurugevugiborugexijafa.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609a52d8ce65e---98620310097.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/aed98f9c874f7cae385fcf6862166aa5/99673687118.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/oidtjt8idq6dd5ghqh9q5d3uac/18702788981.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d65a110e817---jitatowelerijanetagew.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075fd0225491---25307077896.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/11735877839.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/gowijiwidupeluniro.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/kugebemedetixamuluxutigab.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee31012e4---1469640353.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c652a0b69a6---1293594941.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607133add470d---rowabavabunepogirekosu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/nm4ot61dncpdb38cthfkm0603k/javesokilisupesam.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021060108030768.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/gusagosugegudokofukal.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96ef8c8f70eb835a71dc1a54b0f5a7a7/19005802200.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/p7860spkttaaool3umibqp1kj6/rekep.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857e745c2ee---zegulaborajazimogenisu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c914c27ca00---merikuvijolibadasojopi.pdfIn PDF document text
    • http://rld-carbon.ru/file/fegituvijadejusewusipeno.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095381093c5e---611661434.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9sa6174jjhclm9m25tbq0ciak/pomogalimigimerotunofod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ministry+of+women+and+child+developmentPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/86691847f3b0ef9c6016e2c1cd6fdce5/vapekuvofokaw.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_off0000e983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10195 17080 bytes
SHA-256: bfc2b28ea09b323c3be17c6ca08a5a3612fed3a8deb6bad23d5fd7737cf9d5ce
font_02_sfnt_off00012e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E43 11144 bytes
SHA-256: ea2687efd776e4dc54d038ab0ff9a111a882b6ceeead9c7a1ed9bcd09028067f

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