Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4191194c8ea7747…

MALICIOUS

PDF

71.7 KB Created: 2021-09-29 04:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 22abc8f79ca4a5e951d667e3e0f785b1 SHA-1: c8068fb2c97fa405e7716cbd9d84ce5c3b2907db SHA-256: b4191194c8ea77472e702497d144a95b3e82000b339b89f72599f88ff9d05fde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, including those hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://medvor.ru/uplcv?utm_term=augustro+music+player PDF link annotation
    • http://assytekservizi.com/userfiles/files/bozutalenasa.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/59741288571.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/81775098525.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/kupemugisopuk.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/73954635488.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/marojaleladotoremeborape.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/5d2318b8d280cb44375026f5adfc9cc3/tukesubovapoduxemaxeso.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615267d07a868---26250509455.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/70798931633.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210925_191537.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20903836217.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408e15705a3---bokojelezobebusuditunoko.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/zoxisa.pdfIn PDF document text
    • http://eventechsite.com/files/files/11133844008.pdfIn PDF document text
    • http://sunway.me/uploads/file/1010251569.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/tilesakanotezulifodulega.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/58329420835.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/jitopojesogevubux.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/fuboraludiwaliwapefod.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/likiw.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3cf255e7b---40915904750.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/naligifugimoxopukegibor.pdfIn PDF document text
    • http://220-wm01.netdbhosting.com/file/72803922418.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/79885057923.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/36135803933.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/28566554469.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_off0000b62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62D 16240 bytes
SHA-256: f36f89adee9aa7d32d4fc27802323d4e7cb4da0f10c18ce3cbff2859f763e81d
font_01_sfnt_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 10808 bytes
SHA-256: 82cec19c38e3ae3f0572bf38fb6c2a9c2aa9b0eb6a0dd5c6c9d061489e5271df
font_02_sfnt_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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