Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c34d9579fa76125…

MALICIOUS

PDF

79.4 KB Created: 2021-09-02 22:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 389b877242d3dcdadb2875866e2cc225 SHA-1: 32f039bb0e686fe24bfae9e4a8f554954a59f610 SHA-256: 8c34d9579fa7612568646f022e97c7d723a1b9acf3426a415f33db5b750dbd4e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious files. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=simplification+and+approximation+pdf+for+rrb+po PDF link annotation
    • http://www.alex-vasilkov.ru/images/wisdom/file/92318177729.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d3920d79c---86101177889.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/kepibefejebobujefiteva.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/tawuvu.pdfIn PDF document text
    • https://efnnma.org/files/file/53417905057.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089365609395---4246419859.pdfIn PDF document text
    • http://shophouse.info/images/files/ganukuxigutew.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/58290795720.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/bidepaj.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/tesasazulizilepum.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48032350209.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/20252119293.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f047340c7f---vuwedabosemiragisu.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ieqtvon5d30n7eh596pu6hmpa1/zuwuzopukokazifanubegarob.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021072916544598.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/fevodamemawejozopufowafu.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/fifixajuzujel.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/91791e2bc650319d27ae8b9d2500a2b9/46018453543.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/fogosorisonilakar.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/468dc6d7a7d8b16365faa865d77d1c01/35955685583.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/56452170268.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d985f6fc14---zibon.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_off0000ce99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE99 18468 bytes
SHA-256: 977a6b23e1e064a33935735996423632a0f436eb55d1428d309ce6494f6a1a54
font_01_sfnt_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FC 10796 bytes
SHA-256: 3865d85d81f3e95ed8195a80b284d0dd9ed785410337607e1e7491ded7254d51

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