Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93b983ddc7b2885…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 22:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1cd4efe49b192844f6c0a01ec803ec4c SHA-1: da78b8d4d9e0d87114188db57e8015bee9fefcb8 SHA-256: e93b983ddc7b28851d7c0c141fdd6c56a59bc8b1cadb41e0ecf8525078984114
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to domains flagged as link farms or hosted on potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL distribution pattern suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/gosunarogixatinaguzegovo.pdf In PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161346ff15c77d---jopeworegage.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/xanibemanutujikirazok.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/29e7c743c40d09ebb0aeb99cdd7bce5c/tuwunozipasajinefirege.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/zatovoboferawelabaloxovo.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/tovakixuvaxakesovuvu.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/44642234967.pdfIn PDF document text
    • http://goref.ru/files/file/13761034060.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/gozam.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/wurenopil.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/151949419.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/36004185390.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/31454308493.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/pufabewefusuvil.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/lurakasup.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109040000130893.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/85635371380.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/31886317832.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/bazaf.pdfIn PDF document text
    • http://ttc-investco.com/img/files/58466490028.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613196d4bd9bc---ridamexor.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/38a5751384d6c2e608f8a163f96bc5ba/baxuvebamitimazazijele.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/27b3a1ef54887a780fe42bc70d58d598/60892665129.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/4f928ad8f890c54ecbd5f42f3a772f9c/94083221216.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/97071690219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+werkseinstellungen+daten+wiederherstellenPDF 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_off0000dcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD3 10788 bytes
SHA-256: 3801b75056f785c4c7f66894172e1bdb29ed9e9668f77d37e7bd18e940875547
font_01_sfnt_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 18324 bytes
SHA-256: c83bec9b7156e209d038abd7dc369fce477aba1cc13ae687534b8491c7e0cdfc
font_02_sfnt_off000123b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1