Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded78e53784041b7…

MALICIOUS

PDF

110.7 KB Created: 2021-07-06 01:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 266c0923f14289abe5ccd6cebc27f186 SHA-1: 18f291af7fa640e55f3ddea453d59ba1617be3f0 SHA-256: ded78e53784041b7da74ab95488417854506f0bf639b4654653ee3a639702976
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external URIs and link farms, many of which point to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 6

  • 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.
  • 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://piazzademarini3ge.com/userfiles/files/85683538685.pdf In PDF document text
    • http://aqbnb.com/uploadfile/file/sofiravulifixujunavo.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/36c697a7e7bc392956cf7bb8379ac859/vopovavo.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c5d5f1205---kunulolotuduw.pdfIn PDF document text
    • http://nessium.net/userfiles/file/77612562975.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e788e2927c---tiwasefonozamupuwed.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8a7cda35f1a07352c2c2984bc75b00d6/lesigeniwiz.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7474f051378120a694ab446bf75b9d5a/sojol.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/78496490752.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826fe1ed157---76554885047.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce98fc58648---nokotizizibopinuvaz.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/napaxuzexigiposigul.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/36978390955.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/kuuqghdmuctu62musdjmd98qbc/majagimolajumozer.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ekpa969diut3jfbjdbii2dqhs3/pigowarotolosarofiw.pdfIn PDF document text
    • https://protrialse.eu/files/files/63095490868.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1899db3134---46795946795.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b753f6a853c---72168463667.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f61630941e---51247232287.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/80963705307.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bae1c669321---vugukosilajolu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/732e55248c4f20038f67c5ea09044e05/43071508972.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/t4rrqe6fe1ueppo7rikrpvksi0/kupadusefumufodeludataj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=is+there+aPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE27 40788 bytes
SHA-256: 4f22b006ef572aef1122fc9b00230912cca91b47044734b3b273d9329b28a2a9
font_01_sfnt_off00013f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3C 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_02_sfnt_off000154b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154B5 9792 bytes
SHA-256: a0c4d7e879c58af44efc98ed5ce1e9cabb93a8fc500d4992d270eac80a921c69
font_03_sfnt_off00016a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A51 15812 bytes
SHA-256: 87760857ca1ad637f8806de0ac64bee8d18c2cb86f765d2032f83326336aca99
font_04_sfnt_off0001935b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1935B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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