Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89cf699d9cc5324…

MALICIOUS

PDF

88.3 KB Created: 2021-06-28 02:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec672e114ffe0f8253bd8ff4f01f4956 SHA-1: a9d85c90245a9a20504bb72a58ae318369eec7d7 SHA-256: b89cf699d9cc5324225db57e54b38ad1bce447f2fc754c5cefd8b6f0d5851eda
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable domains, indicating a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of its suspicious nature. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://austria-ex.com/images/blog//file/196186036.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab125da9607---vunemokilugosob.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85554aa406---lowetosozivanisulawuzuf.pdf
    • https://abugfreemind.com/userfiles/file/gebexelikep.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903f1213e7f---31432758664.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/fejemuxuzusozegegakivi.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/kfqqhuuev74o6682nt8jn6fnk5/19493033374.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ui7aqc17vfieff9bcti8nm8sq6/96865136666.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16079f49838cfe---37015674483.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/56d2b1790bb8f55c14906955d6a86429/47505113554.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/40168655127.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97138bb373---81952726180.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608be37b71f59---42104900107.pdf
    • http://halmar.info/userfiles/file/sakaxavanavidolig.pdf
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/3779081523.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160acfc1ae9f0d---jexixipunezawotabuluno.pdf
    • http://aaaexpressac.com/userfiles/file/15102334861.pdf
    • https://nuttydog.hu/ckfinder/userfiles/files/fobenewiforul.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/bfaa07b006f22293b9ee21c883d10d06/kujamarozagopokojebab.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/e3cc85bb4ba5429e6b63cebe79d13798/73057039992.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10c48f3bd---saxuvamumilojenuwep.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/5dq1i008j7fn585vdiueqs8htm/zibokedit.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/khhn77fcdcq2upa3837fs3hs8b/5286387839.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/8d8ee90e77fa3e143c8f5479b56b2dbc/nadagiwiwoboxesonew.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=endometrial+polyp+with+hyperplasia
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f738.bin
503d0f6488015f9959cdb22eddf20e30973bfb5f3e01b29aa95f667b39f8a8d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 16680 bytes
font_01_sfnt_off000122d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122D3 16792 bytes
font_02_sfnt_off00013aea.bin
9ecabb235349fb2c79fefda4c464d8b8a54b840b819cf342d6818d1a370d74a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEA 10840 bytes