Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfdf09aaf1a8777…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 12:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b24b7137710e700e4eb97c81bb905282 SHA-1: 1cc0358a3d49d93667a19e6e457d04238aa9e6e4 SHA-256: 1dfdf09aaf1a877723bfe475f5887e83b0550c36c9cf3fb6e8577119a97650ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. While no scripts were explicitly extracted, the presence of numerous embedded URLs suggests the document is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cff4f4a702---topobevugosagowaroxaweri.pdf In PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/wutibujuxejufanef.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/99279818431.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/54470379993.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/867f546b66344cbf2a9cf2de92813a5e/wogadizugifobin.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c88de1890d---giluxeripakuwununizu.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/a5fcfc106549229059d9265cacce56a3/fiduxaxof.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/guxufazo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/t4dkkahe0fehei0cn19v9o3kjt/worotamux.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210615_195447.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/37007819055.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/jemosivifilulol.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/13377912736.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/morebakizut.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099024481177---delupefelibud.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/regikifixokiforijamuvobub.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/kikaj0jdnvru2vpsn22o6i4ks5/80635575624.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/d6fa68394a465651b3327501332f0290/ruxikekufuzolezevoku.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1948719f2---nolejivuz.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7a1b3edd3---17714831581.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087370b145ff---nibarigilo.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160d1881e906ef---74473795827.pdfIn PDF document text
    • http://schubert-hh.de/image/file/45400606684.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/bared.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c4f38a4c3bf9f9e7ec6a937f27710fcf/48618566406.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160abe81f40bed---xilod.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/16236139394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=vade+retro+satanas+pdfPDF 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_off0000df7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 18588 bytes
SHA-256: a24ae8cc364354c9bcde84d52fac2db5cd300667a2df6cc7c1c50eb156865bd9
font_02_sfnt_off0001276b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276B 10320 bytes
SHA-256: a0fccf47acb6bed8f4affbbcec3d2b451dfe2cdb8f066de34daaca0c4881d35b