Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff145ace69d7dd81…

MALICIOUS

PDF

75.6 KB Created: 2021-09-02 01:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8b212dd597d3314b339fb9a5ea0228d5 SHA-1: 91eb57fa89efa1fb67e80fa2c6138fb202cd73fc SHA-256: ff145ace69d7dd819fdfc34466d4632467b7340159678175746aedd1f08b0070
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload. The numerous URLs suggest an attempt to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=present+simple+passive+voice+exercise PDF link annotation
    • http://adaviestransportltd.com/userfiles/file/digosimuzazewujikoxituzid.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160983d803cd14---3471943134.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/xajesifexeziluvedoduxupad.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb01b5efab5---31246685245.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/jgpllk8q0bvt9qtntjiljc0q01/zotexitefebi.pdfIn PDF document text
    • http://centronegozi.com/public/lefarukowosufa.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/moxelobugitizegifasibi.pdfIn PDF document text
    • http://wych123.com/upload/files/gutumozosepeworujela.pdfIn PDF document text
    • https://digireg.at/upload/29456497416.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c319473f415---finigifejomiveziz.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/80393961947.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701b53dd311---poxuzujutamizonu.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/vizusunafarenul.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/rukiwetikiwej.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/dapafufivekojurovudifuwo.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/cddd6925f52728177cce9283eb942a7b/kinifivofepatajotalaz.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0cd707f36936ee22454913525c24de40/winate.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210804022516.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/sabupe.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/25444558944.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43529162c6---nalegamuj.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed1ee8e7a---87102207924.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/14346558720.pdfIn PDF document text
    • http://jerseyshorepirates.com/userfiles/files/zulifamezakuvudako.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_off0000c258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6A 17500 bytes
SHA-256: 1807b8126fe00bda414d191f2b6498aa8eac09e3b9f64bc459eb37db5609ab77
font_02_sfnt_off000107f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F5 10704 bytes
SHA-256: 26a8a8e476a4eca48f8f22009426a7a1d1b4cee657419d4e34e70614309df9cc