Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fb08598c586157…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 07:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 202589917773c7323d1810f5e3b34e66 SHA-1: 22c71c8113424b5290b0463717baea1f2333aca7 SHA-256: 79fb08598c5861577789988ce131f90f65e2bcf4ff98c8442f6c072664cf4d5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm hosted on potentially compromised or disposable infrastructure. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent, likely for phishing or to redirect users to malicious content. ClamAV also detected this as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://smidgel.ru/uplcv?utm_term=viber+stopped+working+android PDF link annotation
    • http://godsownproperties.com/userfiles/file/89223260121.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/43833900998.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210923230843417673x2j5uj.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/3921034617.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/9461347423.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/68243460146.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13404356173.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/95f1f2d35ea25387f8a58bda9a37bd12/42351896066.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/4575804100.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/jewiguxoparamakexuja.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/gaturedabewo.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/duvilisik.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/bufebukegitezagam.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/fipekebetumixuliwi.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/fiwatigigadudijeno.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/zemagasafo.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/32393279076.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/cc85bad7e38c32b50800228973294b32/dafibefavarejamemaminap.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/fonefepiralarekuzanubimep.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/74916959355.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/gewinatafivijofeboxam.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/bbc07amrrsffedn4lfjlo8ngbs/sanududipomevozedu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3415d85a5---66659535786.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/zikotigofajawazawofuji.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/tifet.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136efdea7abf---52923848846.pdfIn PDF document text
    • 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_off0000b244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB244 10808 bytes
SHA-256: 38704f3dabe33744e2d94cd6b8bcf9fbc4dd251a048ca5e3ce03e2b4c48a01ad
font_01_sfnt_off0000cafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 15672 bytes
SHA-256: ae125bac08b1612521b0b98de066a2210113bcfafa2f2d64d3ec265da368b959

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