Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da1123ba7c8748c…

MALICIOUS

PDF

197.1 KB Created: 2021-09-03 10:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7e61a904df1e670203c287fa04f1eb88 SHA-1: 1aa03f044053563b9cd9a60e70a2eea79cb52819 SHA-256: 3da1123ba7c8748cc6ba7c0abdc35f9540b3e0e78823d2ce8116bd49a7fc8ac4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains multiple links, including one pointing to a compromised WordPress upload directory, suggesting an attempt to host malicious content or redirect users. The presence of external URIs and a link farm indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 5

  • 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.
  • 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://archism.ru/uplcv?utm_term=cpc+bare+act+pdf+latest PDF link annotation
    • http://myblindz.com/fck_user_files/file/55144242718.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/57729908935.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cea725b20.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/78453600481.pdfIn PDF document text
    • http://secretinvitation.net/images/files/gajogimenunipogobafo.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/rudemajil.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/xokudezurez.pdfIn PDF document text
    • http://domainecomps.com/documents/files/79934893310.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/xowuwagavulonarig.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/60644675110.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f6453397a---zawurojidanulowofuzosu.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/wofenutojavofeti.pdfIn PDF document text
    • https://dm288.com/slicice/file/51855846366.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/61467755843.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea7c534fc3---95618043307.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/63498411408.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/pogifotavevibofuma.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f68a49b4c2---70909486258.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/68102205373.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/mubugesanimidoragi.pdfIn PDF document text
    • http://hangquangauto.com/files/kutowasutu.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_off0002a3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A3FA 10468 bytes
SHA-256: e6f8ed3dc34a223e093aa55dd32eade41d025670b292dedca3456a6de3e6a6e1
font_01_sfnt_off0002bbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BBB2 19596 bytes
SHA-256: 92718ef01302f2d913524111d3b2f1bda03d6a14d59eb1c59079e83651452a51
font_02_sfnt_off0002ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EE63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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