Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de0323fdd7f3dce…

MALICIOUS

PDF

95.0 KB Created: 2021-09-16 10:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d9184d10a74134f6d361585aff02705 SHA-1: f9fca17bea8d25be55b399322a99bbf7c0fd81eb SHA-256: 3de0323fdd7f3dcec4d2005cfe6a1dcff89f41ab1a4d863039b1e3c1c45f9ca7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to evade static analysis. ClamAV also detected this file as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ketchas.ru/uplcv?utm_term=guide+to+android PDF link annotation
    • http://struttur-arch.it/userfiles/files/paxutojug.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/dixelererixafivo.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/4827217492.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/xekamegove.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef50b8e817---sisuramexeriv.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/govewifumenikute.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/zorup.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/talamefomemavidopakegana.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/18475548025.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/62706668499.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/4568027279.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/numegagudovazapaxava.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/47722302020.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140530d369ba---baxalutamevofogiwiv.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/wibinomiv.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/65751504132.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/kuwebudufajovejux.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/55202636449.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/74626301890.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/xexajikubazubimi.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/92724047645.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/2mvmr1cq3ibdia32e48d865tmk/rapij.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16136cdfb65fe6---zoxotetimufekejodadotaf.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/dolek.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/70378424434.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_off00010cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF8 19236 bytes
SHA-256: 6c65c83222ce9bb69d8b41a70e80c3750b9054076c21b9c29855cca574b064ec
font_01_sfnt_off00013fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB8 10168 bytes
SHA-256: 1d7403cc1685315128e0156441e1286fb656c15cc459cd092b48b0d1ac4f2286
font_02_sfnt_off00015696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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