Malicious PDF — malware analysis report

Static analysis result for SHA-256 2587b7426105db3a…

MALICIOUS

PDF

71.9 KB Created: 2021-09-05 21:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e55485ec2b0f09c6304647df28951393 SHA-1: 12e339ce4fcbfb541222960e147cdfa368a35d1d SHA-256: 2587b7426105db3a05c5739ffb5928054cf9d7a6662dc8ae2c93c9c861bc4baf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://planet-pvc.com/upload/files/wujesekoset.pdf In PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/vc5nj2i3l48vor0nkjm22hata0/xataraj.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/59890246060.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/37614365893.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161141a2e5fd74---leluk.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087defa87580---38983939078.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d59e99eebc---13768855067.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/woxokofesavezivobu.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/582417075.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/10656033007.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/kezavejumeroxixusogizo.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100000619666---monukikosefutafirarepem.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/19500344991.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/rkf07frht9smvp3100vl5fsdbd/topabavonogosabemap.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/10442636465.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608baf79da759---sutututodizebikunafada.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/narojofepibetenuvevezem.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcc1e83cec---lutigidujumamodatirujido.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/tikebizogererixefilano.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/62671049435.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/wutivod.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/91423458287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=java+interview+questions+for+5+years+experience+pdf+downloadPDF 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_off0000b886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB886 14932 bytes
SHA-256: 890104382e3c1d93501f1aa382768e69d154a5a50b42a3750d1b0c39d4be26ef
font_01_sfnt_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 11352 bytes
SHA-256: ede09be9b06d13fea2dfaa4790b10426b9641a06cd6d767444f38bd63bf8f363
font_02_sfnt_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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