Malicious PDF — malware analysis report

Static analysis result for SHA-256 2550407605090367…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 02:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 90ba2cb9cc62ae73c660d982690e7ad1 SHA-1: 418fc14bfb5b272a50c76fa346079030a838b039 SHA-256: 2550407605090367b1eb114852064ef23c1ebac97e4e1c47151eede4d541d437
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. Although no scripts were explicitly extracted, the PDF structure and linked URLs indicate an attempt to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nhabe.com.vn/ckfinder/userfiles/files/64320699509.pdf In PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbcca520944---vafavakas.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160778081538a0---77501046342.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/7373bbc7a0a87c0615800b6ab7c99d1e/45212631759.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160759fefedd3d---zizapizisujigoses.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210630005520.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/1023788077.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/e0a8229f5d32848988c548c3ff0eddd6/rabasutigaxerupiwex.pdfIn PDF document text
    • http://innotack.com/userfiles/files/wegojena.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/80706935466.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/44495814578.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/kumobuv.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/sikurip.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/teziwop.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/jinifum.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/lnd59l13h36bqaqd2eaalpv48n/89685341832.pdfIn PDF document text
    • http://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/kufomadibomulubinigo.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/08040c098d65661de06d9d4b666ce289/mutemi.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/5i0c23i4r5vh6rr523dh3rjakh/31634000547.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/6943606504.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/jodobidipetawemamak.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a8be1c3bc97---57589633291.pdfIn PDF document text
    • http://liyangah.com/Upload/file/26075778969.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/15369768261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+human+centipede+123moviesPDF 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_off0000dfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 19596 bytes
SHA-256: 7159537ca483c341e05561b40589af671693a142c5e7fb77894dec52ea4b88ef
font_02_sfnt_off00012b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B22 11108 bytes
SHA-256: c755d81999354e49ec76bece20ea68ed1035d95dbcde814f8fefd6ecf59af544

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