Malicious PDF — malware analysis report

Static analysis result for SHA-256 df50a357a36bf9f5…

MALICIOUS

PDF

110.8 KB Created: 2021-08-05 06:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3c152ad9ce6bc7bc1d60431cb7c3a8cb SHA-1: fff7d785ccc527b2e88e66c3df8fce2a75b5adc1 SHA-256: df50a357a36bf9f5916b2a536bb6daf607a1bcc98c74e565d0673c805bc24543
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wastran.ru/uplcv?utm_term=descargar+los+ojos+de+mi+princesa+pdf+mega PDF link annotation
    • http://humanitool.ru/userfiles/file/pipalupimetu.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/12639cc2d7d35ab65d15a0d1ed79b477/14387284220.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160864a9a19457---sigen.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607460dc55204---debabezazisuf.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/89727220327.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/6157263279.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/vapevepikifurikemajudi.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/87605695203.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609974d3e02fe---23512737332.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/fadode.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/gowelukaxigopalobaxam.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e22614043fa---36877900746.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fc043f1d0---widajisuraxafajiv.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/9498474322.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/55517646280.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/76698307195.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/giwilifa.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/2fo0kvkcv56pojf8ntcj4iekue/46267983128.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/vozutupezobanalowur.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ocnhc8dk96rabq0icns8eldmvm/zivinakomazozuzev.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/gofesafan.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6282226d6022f0257b4a6d69676f793c/91799331015.pdfIn PDF document text
    • http://amdind.com/userfiles/file/jefowatusuxiwigitoxix.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/seditarududuxizasezivudur.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/b044299bb34ef1d8893a29f3b33f8a63/53538058102.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_off00014801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16018 10996 bytes
SHA-256: 813f88858ee87d757b9657c4e42bfeeeb763c22448b899292014c58a15bc4010
font_02_sfnt_off00017957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17957 19596 bytes
SHA-256: b5d759cabf6b44884773e10231e4b645760691bf586da2099af7f2244ba200c5