Malicious PDF — malware analysis report

Static analysis result for SHA-256 397e3111c3cf9520…

MALICIOUS

PDF

79.5 KB Created: 2021-09-03 08:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16d552a04a60a438b1d5c0760ae2332c SHA-1: 0600e7c6d2b4908d52763a8030aa1af205d26987 SHA-256: 397e3111c3cf952061a4da2bec5ba2372455cf6b50cd805c5607b83bd2d15d55
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to potentially compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://infrive.ru/uplcv?utm_term=lexicon+by+chronicle+publication+for+ethics+pdf PDF link annotation
    • http://archi-m.ru/userfiles/file/23014708340.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/lafiravapabope.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/74971755117.pdfIn PDF document text
    • http://whatdwellswithin.com/file/rokazi.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/pekide.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nixerinuxufukuvodog.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/300841ae6976774f762ffef2b942cba5/tutenufet.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/digupexavoze1628348097.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac749ae66d4---nafovifalogezen.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a25978e2b---mekagasa.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/83658990837.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fixejiz.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/tewuxigomilan.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/72800133085.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/kekeri.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/bexok.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609400a992322---dafamaxubobegix.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/21560196041.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/34123522972.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///59131127721.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b8ee0c1f6811c64be1810bdec558f868/walulekir.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/putelut.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/ld0fcerddn0f4qgs8jglm14fap/pelivumupebu.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/nemimipen.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160758dd2849ab---renitazafowevekasarovube.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_off0000c7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AF 20108 bytes
SHA-256: d2ba38e5e26f56bd95647d6c7fab71d96c6ba0593e385a166ec54cf5fa25a2d1
font_01_sfnt_off0000fc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC47 11128 bytes
SHA-256: a91ffe4f416ce0abe92c9575ac698045357565fb24f0a7448bf49cf7b942694e
font_02_sfnt_off00011602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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