Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe361840884b4125…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 17:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f7422637660a0a8eaeb6a6289f832bd SHA-1: c50846d234884bd5af0acb681af16c5743328650 SHA-256: fe361840884b412543bbd5953e5e0485b2db5a7ea963542dcec5f66b505010ae
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious actions. The JavaScript likely redirects the user to one of the numerous external URLs found in the document, many of which are hosted on compromised or disposable domains. This behavior is consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=definition+of+agribusiness+pdf PDF link annotation
    • https://chokysitohang.com/Uploads/userfiles/files/76948368830.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/76470955410.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610c52258b119---zofovumiti.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611507f1ec6ee---38294890788.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/susubujuminojifopi.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/sg6dl2636dggl9h2s7tiroekfq/77750927034.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/a3c88e0a137604300a7e673c35a0266e/2134647890.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/xetaxafawegulopujo.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/51086920842.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/loresarexovizus.pdfIn PDF document text
    • https://estoniapools.com/contents//files/nokavi.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/97435746583.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/04d1b4da11b9c0c2e602e0a3628d375e/vatusadegategomameva.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/95b511cfab87230d8698ced5e913977d/24752808616.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/g4ttp2bh832jv4aht4374no5op/10407910460.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/lulilajatanajepabixugi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607429510ef01---98972736146.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d72944fb---78764672035.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b58efbe66b---3327127775.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/volibiseregobexov.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/fotuvewalolifeval.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/12748572928.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/fiiav6uhe1pgj77tvfsvttgsrq/55237311053.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbfa32e626---lumumufip.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075280f30f4a---danumurimedevuf.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_off0000dd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 10868 bytes
SHA-256: 8628fb689a360882c04af4fa1a56e3fd5d79bcad31c9ca22b0bb2181488f5b8b
font_02_sfnt_off00010e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E88 18208 bytes
SHA-256: a23e4840ef0460af9ef7d8f3b81edaf87d1727a5773357d58167d1789909ea9e

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