Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa523c9fe5baf75…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 07:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c37010003821f5f09cf9b4bdb733e549 SHA-1: f32dc93368ffabd4c31e69fec7195adc3c581b5d SHA-256: 2fa523c9fe5baf755a3dfa671e572af77797bbe58300b5efaef71555ec5aebac
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://lycee-elm.org/userfiles/file/webelafasawapimu.pdf In PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6f18d6c84---galapoputekejabetepoledi.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/37338885528.pdfIn PDF document text
    • http://www.puhito.hu/uploads/tilatev.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608907a090440---88399392392.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/totatijotizizab.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/438c40b4fb0232315476e4c53f013c99/zirurezezuwevewupideloxef.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/71s1c5jmgndrml3f1gmif40dcc/jiridedewabakizagarolozoj.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/17822686069.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/19868364416.pdfIn PDF document text
    • http://lgassociates.in/uploads/15204786166.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/66ede2130770e09387ebf37c42b16318/nejotalegogibexevapuwibil.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/52257279180.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/88741676168.pdfIn PDF document text
    • https://dm288.rs/slicice/file/xetopaziligiripak.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/selifirafosufawerowevo.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/562dcabfd5675a01228c1003c90b781d/dazule.pdfIn PDF document text
    • https://alariel.be/userfiles/file/27084001464.pdfIn PDF document text
    • http://epicridesnepal.com/files/25864749900.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/68665012422.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/kifujadedu.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/fisolutetovaxamudefed.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20788eb16f---58328786003.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/zawiguv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=estadistica+anderson+11+edicion+pdfPDF 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_off0000ce4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4D 19228 bytes
SHA-256: 285ad93f6c70ff61ff6be3c2e4666087be4ba4e49aac14f82332c35b61ba85c4
font_01_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 10604 bytes
SHA-256: 0d3d3adaa2d7985a8a8f23c46cbeec5ad182da0a6e0a9ceb7fd94d0d12d802c7
font_02_sfnt_off0001191a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1