Malicious PDF — malware analysis report

Static analysis result for SHA-256 f719904ba76dafbd…

MALICIOUS

PDF

74.0 KB Created: 2021-09-09 15:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6da6d9025b1ed9ed0647c50d8f663df3 SHA-1: 2eeb03250e70d23a289a4d2c156ed29899f3e568 SHA-256: f719904ba76dafbd4b2a3adfce9970af17bcbfcae651f4a9ce56151624cebda6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of numerous external URIs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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 https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/38704580493.pdf
    • http://korytnica.net/data/files/12812440819.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/nubori.pdf
    • http://khachsansapa.vn/webroot/img/files/bapiwegegiwuzififilef.pdf
    • https://reclamesticker.nl/images/uploads/file/
    • https://menlopark.com/wysiwygfiles/file/40479741935.pdf
    • https://henseltech.cz/userfiles/file/99252221122.pdf
    • http://gesht.ru/admin/ckfinder/userfiles/files/wepunipapomalu.pdf
    • http://erulingua.hu/uploads/content_files/files/futon.pdf
    • https://jagamimpi.com/contents/files/sodomilolelofezapik.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/nnl6duj7ugb65avs9k38cnq3vr/77992679661.pdf
    • http://lovepetclinics.com/file_media/file_image/file/voxarikibawobupibexanava.pdf
    • http://ambulatorioveterinariomariani.it/userfiles/files/gikilomavagosagaxavo.pdf
    • http://wildpflanzen-planung.de/file/18740898217.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ebb095f0740e02268ad5d475dcbd1ff8/40460130873.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c99dfe0bbaec1f21b6c36db04e1b0884/31889882212.pdf
    • https://zebcom.in/userfiles/file/maromil.pdf
    • http://jncs.kr/page_data/file/20210905090308.pdf
    • https://dananeye.com/uploads/files/202109051716223327.pdf
    • http://ozkayalarlojistik.com/userfiles/file/xuvoxefaw.pdf
    • https://loyalangkorapartment.com/userfiles/file/dunusu.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161371e850a16a---6703299076.pdf
    • https://hyundainhapkhau.vn/upload/files/82305104603.pdf
    • https://myphambambi.com/webroot/img/files/66057788003.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+way+home+pel%C3%ADcula+completa+espa%C3%B1ol
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba17.bin
a6b956cd36927b0cb997e309f0dcb2b6dd3dab80f8993231fc74e4d8a63b09c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA17 10876 bytes
font_01_sfnt_off0000d327.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD327 16792 bytes
font_02_sfnt_off0000eb39.bin
f68dbdca3aaffe0f81466834038b8df658de47a07515cbe05b211f61c0186065
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 17320 bytes