Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae29b7d80a57d6c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 00:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69abb945d6032e6a37d36b2c082f5665 SHA-1: 313cd4a3fba449095ab8a1007b461e3bc2428e92 SHA-256: 8ae29b7d80a57d6c1b5c7fb840521d041d7f132ee9ea0d0f49588d636515e325
96 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and embedded URLs suggest an attempt to redirect users to malicious content, potentially leading to further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/39412e4f6b4231ee2b8ee4425b6a4cbf/86027381322.pdf In PDF document text
    • http://2sisaccount.com/userfiles/files/ziratawudov.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/1caa15d02f00620e6dd485396d17bb57/78076570139.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/49549717198.pdfIn PDF document text
    • http://cutskytools.com/d/files/ramuvakupe.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1a9462ccdde95f478811097814000fdb/99935887552.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/78m5lve84g60boq0s927lejbc0/dasidulomuxitolid.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/xomalewaxiditonem.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349292a0345---29406379847.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/0b3e99934871b191e24a4b79dda8f20a/30201579061.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f048f83b22---61679496835.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/jegovukevasugudimonuloso.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/17452467192.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b731824f4a---67286972405.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/35871747106.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/tivikodubu.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/686295688.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/wolisukosedojivas.pdfIn PDF document text
    • https://kopari.hu/files/file/risodunitosup.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/manalawasigapikoxu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613c38a5e7f4f---22774032946.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-19/20210919050437251408.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140affc11df0---88077163196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+transfer+data+from+android+phone+to+sd+cardPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0d599e0dddfb7fba7b3faa3dd050985a/rexisomanasuju.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_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 10916 bytes
SHA-256: a6efb47305a8a5977223494b5b2f02d785b8a156de676f91e39a6455b72cdb1a
font_02_sfnt_off00010faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 17344 bytes
SHA-256: 29a9064aa99d76dbcdbed5694df3204b0138e989c7cee9b09416f593f5e1b923

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