Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a15cc88e7f6deb…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 19:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9ac9cb92f03c468d9ba26046e0e88e18 SHA-1: 804f551fa0f1fc143bd768a34f6093d88ac55073 SHA-256: c0a15cc88e7f6deb30888341b2f334e5b106ec45bb532a1e086dedcaae26db4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://avvolodin.ru/upload/file/jiligusevafunepapatav.pdf In PDF document text
    • http://ng-sons.com/userfiles/file/xulizekug.pdfIn PDF document text
    • https://cityface.cz/res/file/tojolipigezenebunuwugorad.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/28073444777.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/86078863695.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/17733918696.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/ruzavaweberowat.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/sezatusevebuwukakatawila.pdfIn PDF document text
    • https://j26clean.com/upload/files/ruzemujusagilid.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/povubisarituxoted.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/nazeti.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/kosoxo.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d219ddcf76---mavasujipar.pdfIn PDF document text
    • https://visualarchive.bg/files/15087950964.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/sasezuwidevutekalumegur.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ab1af045b1ecefc9cf48fb5b50b88b79/suniwekuromu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/mjcq0dij97843k17bdd8lqnvo4/74870816457.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/waragafivumu.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/33425097083.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091022290673499.pdfIn PDF document text
    • http://asid.rw/userfiles/file/jexupirogezizageviruluk.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/bukoxowilizam.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16151264c0c798---mepilejitegodusexifuta.pdfIn PDF document text
    • http://tajilin.com/upload/files/79922817438.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/aa304d53a3a02fde97d712a034e465da/regidapixigarexulawajidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=attack+on+titan+comic+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F5 14728 bytes
SHA-256: 450cfe91d96c999a33ecce0e5bc3c4c79c2a40f68af6e75d3d3cbcbe8ac120c8
font_01_sfnt_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 10408 bytes
SHA-256: 154a827e42c8584e6faa4870ae8ef26d6e394ffd0bcc99b7bd36a53f6fab8a90
font_02_sfnt_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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