Malicious PDF — malware analysis report

Static analysis result for SHA-256 69dd2c52ec77cd02…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 11:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bbbc95bd23b7611f5fd364507c7cbc99 SHA-1: d6d4d045ecb3b43aed4df79e54e65bef5a70e4be SHA-256: 69dd2c52ec77cd02b3bd05c338e4aec3f8167a5d66979233c2a1049b7131a4de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. These links form a link farm, a common technique used to obscure malicious destinations or distribute phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mimpiindah2.com/contents//files/kajimewitariwitujomok.pdf In PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/81v28lmgsdnmb3mobv6s8qh928/21987621185.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/28404310089.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ttpf25ntoreklngunu8t0tusn9/kemerufonelelaradofa.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/lepifivadatozufewo.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/85170251189.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/11172209737.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/vosimaworonemeke.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b563925da79---9372309328.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/pemesovidi.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/limujoretorubudeledizil.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/fefuxatib.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/d04e89976a439bdddfd3fec9a72a6ba3/minibewejefojokafubupor.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/binari.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/kotugikomatulimutupakis.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083da3525b8f---mowobijapij.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/26113930822.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/522931ec146f0543eb2e87b35429abd5/dunegevevaxexer.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/65508492088.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/musekazexazivilu.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609040a5b55aa---52479376465.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/80433924578.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/65341034534.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/mabexadavesiraxatonuxed.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/55363308592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=spring+boot+books+2019+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_off0000de60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE60 18268 bytes
SHA-256: 35336201315e1a1e0bc1294fddc7f97278e2d04e5d29c0cd80348bed5a9977b9
font_01_sfnt_off00010d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D32 11100 bytes
SHA-256: ace8135f5c46664bb493c8b0d48eda7c82c4956c25dd9c9bfd2d3076d3e9afa3
font_02_sfnt_off000126cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1