Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a56e8fedb0e27a…

MALICIOUS

PDF

69.0 KB Created: 2021-09-03 17:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bf52dbc9855a057949f1cea696a0fc2d SHA-1: 3e29304593114abcabc089a09ef2c90fc112822f SHA-256: d8a56e8fedb0e27acefc9f38522fb878abc5504cb73e5818b6a4e6bb380e37aa
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by an ML classifier and exhibits characteristics of a screenshot lure, containing minimal text and a clickable action. It includes numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. No scripts were extracted, but the presence of multiple external links indicates a likely attempt to download a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=how+to+change+kindle+format+to+pdf PDF link annotation
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bababad5cf8---58693582407.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/25d8ad15697519db479183958c2828df/82291103514.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/81417551585.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/xasovenabujarupefoso.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6764bdb7---tuvokizufifiwusipofox.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/a0576e5e706ac0d9f786bc3cc9894ea6/82968204381.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/gudekojoduzotaw.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/hsph00l4amoeevbri2f4pvbtpf/45887782393.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/24113762444.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/pi4uv3k9dlul5qg2aa4paqbpoc/lutadidekokafopavawezidu.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/17821239550.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/66768164217.pdfIn PDF document text
    • http://hak-al.com/resimler/files/wetetebumixejasorap.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/robozewinaxeza.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713ec2c9d4a---dinexilijirefev.pdfIn PDF document text
    • http://mebco.ru/images/file/tagofonupawusikuvuduri.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202105281917255090.pdfIn PDF document text
    • http://carsonandchain-ip.com/userfiles/file/worawelowivexarodonibe.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c3f4be775---7418774817.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097cc4f83447---vufatotabixigidexobi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/637f6c3b43c47af095b54e0b19e49b60/449754524.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/54764366740.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/mulakuponebaxate.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_off0000b234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB234 11068 bytes
SHA-256: 8585d7a59b8456b42eb395cdb7a313dbceb090cd98dbf200b091b20358b7de27
font_01_sfnt_off0000cb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB92 14144 bytes
SHA-256: 93bdb7e4a03eee01d109d0ac173246f0034b423743d2fa9cf285ed76dca76049
font_02_sfnt_off0000ee7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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