Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0de082f7d3dd83…

MALICIOUS

PDF

84.5 KB Created: 2021-07-17 08:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7fe2fe129068c4c90f9f56ea6f9c90c8 SHA-1: 86154b8928ee2f94e19ebfbb74db2efe1718555a SHA-256: ae0de082f7d3dd8338b2c1e1839ffe3dee648a1222e084a6143f0f921a2aca8a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains a large number of external URIs, many of which point to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://pelesiuvalymas.lt/i/File/nudarofuji.pdf In PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/4be4fead7bcb9b109a06aeaf63111ea9/kifinojugututobowapefo.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d8973c7f416145ea22220d69ca84a34c/sifodik.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/e1f9bdf29a9e2220f259ad65d4e608e8/fajomimaje.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8604ade4593e5780d9f86860b02884d3/vafokop.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/6e9p1rj08ira3gc4pvjbt90li3/74782398724.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/wobipidid.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/5d21d7574a61b2e7abbd669806e072c0/xufere.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/voluvebawi.pdfIn PDF document text
    • http://jarosi.hu/files/file/42501493727.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/77020864544.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfc924c1cc---9369425111.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/zirufefadujifi.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/43034387414.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/fae7a7cbe0f0f77d6166f9fe5fdfafcf/xugoxixiruxiwukada.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaf0c012b1---wuxelegogudewodobufodop.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/19794805778.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/xirukusogofob.pdfIn PDF document text
    • http://cartolmania.it/file/xutakerumafeledofimedobeb.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dad7af9fc6e---xogugirenaxaxilajo.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/d806a6bd35e98180c5bf6324feda6527/94241096867.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e7212a88a---89520946268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=craters+of+the+moon+cavesPDF 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_off0000e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F5 10560 bytes
SHA-256: 3dc17c0378190deb3627841fe3ed9377d11c47824029dff30f502ceb8150c001
font_02_sfnt_off000119ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EE 16724 bytes
SHA-256: 331be848e2dc9a6ded8dc1ba092321c2daa9803623250ae884e11cbcf4b265c1

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