Malicious PDF — malware analysis report

Static analysis result for SHA-256 7854e0b1a9b7e1f0…

MALICIOUS

PDF

71.9 KB Created: 2021-09-19 14:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a700ecf964f197e8079792bf7c8d550d SHA-1: 843d19fdac3b66f3109df23c7227f3ec1c72423d SHA-256: 7854e0b1a9b7e1f0c76f177a4efdc97d7155ce57de001414a0a4d98b62084ab1
96 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable domains. The ML classifier strongly indicated maliciousness, and the structure suggests it's designed to lure users to external sites. No scripts were extracted, but the overall pattern is consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://gancza-yacht.pl/userfiles/file/xajuziregapi.pdf In PDF document text
    • http://happy-land.hu/editor_up/79885352914.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/92118474727.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9cdca218c---suriduvojojofufuvi.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/vimibedagabogodu.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9d6aba539---90062775063.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16143dccfadb1d---36367533629.pdfIn PDF document text
    • http://stisk.com/file/bedodanufazetezuzovasu.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/budotoxejotudew.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/difowivuz.pdfIn PDF document text
    • http://vo23.ru/upload/file/mewilituto.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/5567250796.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/lisalis.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/85897985292.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/28690315966.pdfIn PDF document text
    • https://cmoretv.com/userfiles/231249882.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/15861571806.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/54371916648.pdfIn PDF document text
    • https://tavio.ru/files/file/73085643093.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/karetexotanamulewu.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/rolinemapapote.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/walagiwokidepinajur.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/56422289603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=divergent+streaming+gratisPDF link annotation
    • 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_off0000b640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB640 10352 bytes
SHA-256: fc0de4a7bd49965557f859e016f8eca38d594b970510a55d0b97c4602d4b65e7
font_01_sfnt_off0000cdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 17292 bytes
SHA-256: cd61bf0a2e0c0ac1e02ef50fd273eb336a4e7df0db47a4c18a63ae4b7e1ca727