Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef571f5c27057c3…

MALICIOUS

PDF

75.2 KB Created: 2021-09-04 17:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8bc1c1eefbb3a716795fde9dbb8cb46 SHA-1: 080adc0df22fa4606376b7cbc5fe5e62159edc94 SHA-256: 4ef571f5c27057c38ed02bef56754e4bef8041b900976f5e2bec7911095de3f4
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with exploitation attempts to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://oniceh.ru/uplcv?utm_term=online+doc+to+pdf+converter+for+free PDF link annotation
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/41700cf66a022793cf78a5d529209dfe/7221090527.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/nagutirisekufika.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/xajasa.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/sajumizokegupivepoponu.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/83229414051.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072a8aa7cf0d---60256257171.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607465c49b4ac---wowulozomoput.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/59572278660.pdfIn PDF document text
    • http://camelliafb.com/uploads//files/202108050754526460.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/22923654717.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610c9ac0d7b59---dizefe.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/zuxomodagotukarut.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/39394947745.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/2ef0cc656fa0ef40f8ef8bb8e50e77d1/42069880262.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/84674500396.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/wajorodamamejife.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/cd03bc076438a672676de98340dbfa7c/5770224601.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716b4f50daf---bujaxoroguwijetulexi.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/edda6d40a433d7d1d6815087bc688358/68423489701.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608846f9ab98d---xaxineg.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/kovazetopogadaze.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/valimizarujip.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/lilefewe.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/nididerovofunabuti.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/18957dbd1ef029af1e7153011bc44ef4/petojuterulogowa.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/bamanukajo.pdfIn PDF document text
    • 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_off0000c525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC525 16504 bytes
SHA-256: 9f1e82f9d1b96ebf991dd1d8b82bac363c2c75cabd8289d6eff6914031dcf80c
font_01_sfnt_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 10372 bytes
SHA-256: 571314d068c1611a429585607dda55deb09a1d5487f8629cb4a89df971a0a468

Open this report in the interactive analyzer, or submit your own file for analysis.