Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa1c5a27261d659…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 04:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96c087f968b6d1373eb5092e077a838c SHA-1: e2c90b314d95f1a8abdb17fb15640542f45a7539 SHA-256: bfa1c5a27261d65908cdd9de7b964ebfd2d306bb7dd97de3aabfc7218cb60bbd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting or compromised WordPress uploads, suggesting a link farm or phishing lure. The presence of embedded JavaScript further supports malicious activity, potentially for exploiting vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ybshajiang.com/userfiles/file/2021-09-05/210905094200951024kokhx04dwjhz.pdf In PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/wexuzimijolazesufabu.pdfIn PDF document text
    • http://sartor.ru/upload/files/getotemubuxokosokiwo.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/20880894190.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/86718690053.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/48976769249.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16144303d5be09---noberiterarope.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/34261466723.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/mibabupupiboxunuwi.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/pogesipivobutepawajuf.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/97947184060.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/81390398674.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/zigezewaromafarisivitot.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/vogev.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/tojazakozojibenulibebu.pdfIn PDF document text
    • http://runhouchem.com/upload/files/vepumimipakogelupiropos.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/49301308944.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0e3cb3b10---87244403109.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4c152ad2---53038277217.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/97102959338.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139249f9568d---sirekolonisibobujakupedam.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/sepakuvodesevorosepob.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/32673545534.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/4f18d44ad1d21ed799d6cc351a6f56a2/robudegonapiragoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=moon+wallpaper+4k+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_off0000c3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 17212 bytes
SHA-256: cfdcd7403d6cc8fae0d3a6016c8c2dae0b4eb15fcede0f1869a253e0c63fba84
font_02_sfnt_off000108f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F6 10368 bytes
SHA-256: 4b0fb988da3b90f6eebf9e7eee4cd4dea36b2a518e07d190af1ce5b97dcb727e

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