Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62c7ad2bb6a7ae2…

MALICIOUS

PDF

77.2 KB Created: 2021-09-03 11:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc9420cdc1084a8533532f0a73de76f2 SHA-1: 470f4e5e62c409d47d1025a77538e8ed2f467834 SHA-256: d62c7ad2bb6a7ae2311f0d649f2f32a87bff546846514cd72c6ad99530290278
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to WordPress sites hosting PDF files. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to obscure the final destination, likely for phishing or malware delivery. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/ro11tf3qeo2gcj0iqtjodfgq81/gizofajinuxo.pdf In PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202108140111518069.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b6d9b8e96---depapagefonakipukivupon.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/76a35057bcfdccafba7bfb8eaf1de94b/vubibebuberax.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/8535932519.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/42268838382.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/73415675620.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/kuxekiguzeniwudikifufuw.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/86862862937.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070311f06e0a---bunir.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210622153838.pdfIn PDF document text
    • http://614move.com/clients/4890/File/lepubinadamopimefori.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a1ca28aa---44133366124.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26adf11e54---97877510738.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607159e0e542c---nikoji.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/r5f3soluidisuh63m97rdala80/kafigaguxekivipigiralatum.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086a2187a0f8---7505379387.pdfIn PDF document text
    • http://koala-al.com/d/files/86594067937.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a02447f4194---78608568969.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609122ff8519f---23044490569.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/tojukizeravujatavob.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/mobibajefuvufawux.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761eb3384bd---dipomanipuxanawubefekofo.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/82227545604.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/257b97ffe3ee8974e23365a5b028935c/pinepolilitisivawilasivor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=%C3%A9vacuation+des+eaux+us%C3%A9es+pdfPDF 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_off0000c43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43A 10888 bytes
SHA-256: cf891ee33686be5ac02b4ba9aa2baaa7ee36c3b6df433bfa953f813e3ae8cea9
font_01_sfnt_off0000dd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 18768 bytes
SHA-256: 3bd8a55b29aff2fef54845292210bd39d7b28928179564f6f980f5d45040d5da