Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c0f008294ab341…

MALICIOUS

PDF

75.1 KB Created: 2021-10-01 00:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d6466d7b0a646ef1f4c8b676207b180f SHA-1: 4acd82511258a8137ad2405179f822630bb3a955 SHA-256: a1c0f008294ab341f15255d35f43aff73181f811825e11beb74cc422baa09a4a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised CMS uploads and link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://pixomot.ru/uplcv?utm_term=bangla+font+download+for+android PDF link annotation
    • http://cityclick.it/userfiles/files/ritaxej.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161533e23c6724---58554518887.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/20119647157.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/15716793921.pdfIn PDF document text
    • https://nppgursaraijhansi.in/ckfinder/userfiles/files/sudalupeworo.pdfIn PDF document text
    • http://markone-tools.com/upload/files/68887850444.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/93878234369.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/30572938920.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/konakadiwe.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/dugitarozijazipopul.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d24999f237---69798990739.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/58049623914.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/wibef.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/8254394825.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152158020e98---puwadan.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/xopezolosireboso.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/dikitixopuzategefubira.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/mejisiro.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/dutakovuke.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/83779206533.pdfIn PDF document text
    • https://domilot.com/uploader/files/51241781338.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/4883358719.pdfIn PDF document text
    • http://kohaz.hu/files/file/58406178141.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/98220602178.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/13202612582.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/goxujexubadipizojewo.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_off0000be87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 18672 bytes
SHA-256: a6d53087c1f37be97aab8c66a70de919b3204585005ee6a269e08df77b5c5981
font_02_sfnt_off00010747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 10368 bytes
SHA-256: 470fb475c53432cb62d26f4d41bbe397b2ae941ce197ed34884cc1f966a93daf