Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f66ae87ea55a3e2…

MALICIOUS

PDF

85.3 KB Created: 2021-08-06 15:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 098298a9af3e7dcd5aaa2e29c36921b5 SHA-1: 1a1b494e205a66388bf14964f31b03620d977b3f SHA-256: 7f66ae87ea55a3e2cf0f37afec469d567e7870b5e20163b8e1b08364090fe280
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and other domains, likely intended to trick users into downloading a password-protected archive. The presence of embedded URLs and the nature of the link farm suggest an attempt to deliver a second-stage payload, potentially via a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://khiconghoixuancong.com/Khicong/admin/userfiles/file/xabowiferefi.pdf In PDF document text
    • https://branchennachweis.eu/userfiles/file/majod.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d2bbdc68ca66c8262d97055f4859c82f/zejalazuloparebu.pdfIn PDF document text
    • https://cecprint.com/images/file/xetemijaguwefajezifikewe.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081550784f44---bigumilevigidobomegube.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/rulapuxogatofipev.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98bf578185---wibexukuvafebonu.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/67176114853.pdfIn PDF document text
    • http://brukbet.com/user_images/file/9230803635.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b77ef56afe---soxojexajeligo.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/pulusoz.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/0d2nue261k3gmfcl5sv7efui55/98002189049.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/12619227435.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1598801e6---gefugalisaxuvuzusazal.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/pitafakizibiwisu.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/wobimunujavabizepifegozo.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/79a68a3ef277c1e9cd31c897c760d72f/38636996345.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160829d9311d89---tudatizetirinamato.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/3424600460.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094c410f0444---20603648278.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/6cthvbd4po75ojmsndsoifglad/75855400.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a8db3a03c---semofazagidode.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8503a8701c387b42bc05bf45417e563e/75241837570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=download+game+ets2+mod+bus+indonesia+androidPDF 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_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 11036 bytes
SHA-256: 5eda7628851a23fc5d9771eadb5128662e397fdcbc8da1f2d87ef4716d1fc53b
font_01_sfnt_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 18504 bytes
SHA-256: 1546a9b5aa1382af05deeab6ac0cf67d4dd50447ef0e282840ab60dfe4952929
font_02_sfnt_off00012e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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