Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47478a86058486d…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 11:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 98b2a6cc4b0926b9d14f367dc7f113e2 SHA-1: 49753a80ec63d87d59eda22d348b7b227022a17d SHA-256: c47478a86058486d1ddbf61e42ca9d2f90932829eaeb09fab79f4ddea5456a68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it is used to distribute malicious content or phish for credentials. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to leverage compromised infrastructure for hosting malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=upcoming+smartphones+2021+may PDF link annotation
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a929c0e95---majexugurovujasi.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/99498071528.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0452b1e5f---pejanaxe.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/56315698592.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/vidifigosoxefalowu.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/powoxadetogowadebafu.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/59316798156.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/80872251752.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/13797383319.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613470ac1726f---tuporafidowibaxufadu.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109170043223445.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/jupojadoselepu.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/zukugemoda.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/bejewewofozima.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/37754044772.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad6306ecbc---suvemosotuduwugepagekiv.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/523cbfd0e2dcb01e9eade9d903c5e631/8725141765.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/98460438475.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/dawuki.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/113406550.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/fm521sdhju011aqhl5ufti9te8/gumovutegixelipuzi.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_off0000ac97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC97 11192 bytes
SHA-256: 83818bef81686e443a0db95a42f2b9979ea0f1315c88624b8f0623ba92836202
font_01_sfnt_off0000c6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC9 16228 bytes
SHA-256: 7e0466fb1f1c8bca90f0f0aa802b58e3343a9809206038e9cd2a4049086eaca0

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