Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4a26f943e92f53…

MALICIOUS

PDF

68.8 KB Created: 2021-09-30 20:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7a5f31d47bd4831829909818f0db0606 SHA-1: a7b76254ffeb9084797b6a0b4cd638b4d53294c0 SHA-256: 8e4a26f943e92f534c5d9f127a513fca17bd047ffb89ad87633a5aa01f5be3e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, indicating a phishing or link-farming attack pattern. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b6eb3b6d4ec197146e5b9db20fd15d6c/39333971070.pdf In PDF document text
    • https://alibrahimtravel.com/mycms/uploadedimages/editorUploadedImages/file/86564561978.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/xosamivafalisepeledi.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147d52215f9d---tizorefifogazegiki.pdfIn PDF document text
    • http://winso.tw/userfiles/file/4838220549.pdfIn PDF document text
    • http://hijoin.hu/editor_up/fokarugulogidemerupizut.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/42479459779.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/71019303776.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/gubada.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/96793528775.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/nufezevojetalekesifejok.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/8kgt3bgn10t51ab9piuhmk8u9s/zusobutamomatebusituzupit.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/34328115918.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/112073984.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614593e465b10---gawudozedoseneto.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/sepodudelinexuji.pdfIn PDF document text
    • http://qdjshg.com/files/file/noxejevade.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/vasewagutimaponawesarumin.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/27267152203.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/pigokuderowi.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/30012228108.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/69713517032.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/80674998745.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/fofos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=best+free+diary+app+for+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_off0000af38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74F 10612 bytes
SHA-256: d0959b2483d18fe5f9e67f467e0677b96bed8864812f10a4031edbd550d611e9
font_02_sfnt_off0000dfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBC 15216 bytes
SHA-256: 9f1dcd575baa7700f1468a123d49f1d7748e5255f00fb4e1907804eeafa3e6ce

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