Malicious PDF — malware analysis report

Static analysis result for SHA-256 336aa998a287a7a6…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 06:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9355a9a38e9fce46ca591a6c87a019ba SHA-1: 1b4e5584ab709641ef86774c72f6fcb6a4f89416 SHA-256: 336aa998a287a7a6110c48701cb2b1901e70b87b48bcb1ba4f0f97177f135112
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or manipulate search engine results. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs supports a phishing or redirection attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://paliukenas.lt/i/File/xefejemudunujake.pdf
    • https://ikima.fr/uploads/file/95820107706.pdf
    • https://aydin-elektrik.com/resimler/files/62008075112.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/dsuq8u82edakn3db3mruhgia84/30373845069.pdf
    • http://bukharaatlanta.com/sites/default/files/file/lotasewiwe.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/6m1j4miq14aemjl88etvo1v0i9/gabalat.pdf
    • http://sjhrz.com/images/upload/File/73557563716.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795371289c8---68469881477.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/benujaseg.pdf
    • http://baihsad.com/userfiles/files/20210725_202011.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1243349168609ba8c49b55a.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b07c177b7---sekatupediforejidakosidat.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/7nb0du4kftlindk67ohe16h8ms/94321264219.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b16d8f5d9c4---ranadekimewo.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/t5uqg64qoeidg5pnojsp56qf1m/vesewubavower.pdf
    • https://giant-nano.com/app/webroot/userfiles/files/21409663172.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/15912806805.pdf
    • http://cloverpark1959.com/clients/51168/File/razejipenikasujurela.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16105e1dd88b77---43898251574.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161302f59dac5e---21221159862.pdf
    • https://relaxbotanika.cz/ckfinder/userfiles/files/30943083255.pdf
    • http://www.jysunshine-hotel.com/up_files/file/14353492207.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/d9462476039ec61f3c86db91b0503f76/xukusa.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bf388a5ea---suvuwerov.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb60b08b8---novopinide.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=fun+based+learning+worksheet+to+teach+balancing+equations
    • 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_off0000da0d.bin
a88904c7eb1092ceb3784988af04c5865cbbed9cad651fa9b3ac0c30dbc771f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0D 11188 bytes
font_01_sfnt_off0000f3b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 16792 bytes
font_02_sfnt_off00010bc9.bin
8839764abbe074b46a66ef9f298b4b711b8c77b25602c5eff18436a77dd32159
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 18376 bytes