Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8834b6dc339e77…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 22:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23d1268204fa07dff2ad03332e014179 SHA-1: b5e7207473cf6d9c05756a8867dd4ec46361a5a0 SHA-256: aa8834b6dc339e772b80aa782b50ac421cf3e5509e99db0a8ef7968df265a7bb
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning to redirect users to malicious content. The presence of embedded JavaScript suggests potential for further exploitation or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://catamma.ru/uplcv?utm_term=daniel+goleman+emotional+intelligence+theory+pdf PDF link annotation
    • http://studioturina.com/userfiles/files/rajesuzasupofijufanuwu.pdfIn PDF document text
    • http://oodow.cn/upload/file/210910190127973679z9roa42v7mdt.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/numuwepopireboguwijoxu.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/jomujuperubufaj.pdfIn PDF document text
    • http://rococosofa.com/files/files/dovogujotoza.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/3436106412.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/bufarexofukefelurigula.pdfIn PDF document text
    • https://heyratacademy.ir/file/53811243146.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/wasunoruwa.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/32541a7bd40f1dfff3f467715a63d160/jobedim.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/28752140210.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/41331988131.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/juxosotateveledudomub.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/repifudazilorew.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/nifalepedamozifak.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/53414883152.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/rerovademefiralapovima.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/vudafinuzotizulimekitojul.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/xomigotifajozilusanewusof.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613df7a26c129---fapefaj.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/mugutego.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/88387019214.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e616537491---nemokunep.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_off0000df60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 18084 bytes
SHA-256: 52293781291bca33fc4679d4c086977ab472f343acbeafd2be558ca00ac94815
font_02_sfnt_off000125eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 11012 bytes
SHA-256: cfc427c44962d7eaadddb9d07f4587ec0b7c9581094bb2e7d33d362929f1d7de

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