Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd6de9cf09b707b…

MALICIOUS

PDF

71.9 KB Created: 2021-09-20 04:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce73a25a63c4d6243567c150aa5b3572 SHA-1: 9d4e0417f34b7cda1304989ba8f9f4311f32cb90 SHA-256: bcd6de9cf09b707b16e43e811c6f80eed283d48eb3be05a963d97d3674852920
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308f32f2651---99186077566.pdf
    • https://bodegoncriollo.com/userfiles/file/rimafazuvezogiwuzikatan.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/rt6lgkigq6lui7hk1607n93fhl/86918914804.pdf
    • http://vindindex.nl/images/uploads/sunijabiruwapexakag.pdf
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/litipebuzin.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/fm0hqav6h7vgl8oa67pmpi0s2k/xirepemadaxados.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ace04df1---juvonufijare.pdf
    • https://cpc-serbia.org/js/files/70199419590.pdf
    • https://we-plus.tw/ckfinder/userfiles/files/51041091387.pdf
    • http://4998horo.gmmwireless.com/contents/files/32680311105.pdf
    • http://solamsys.com/userData/board/file/foxozir.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/55964068900.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b54cdaa7b821ec37f6d0b33f3cf9db53/79054266708.pdf
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mufupagefefonupurux.pdf
    • http://drukarnia-warszawa.pl/pliki/file/gumodusodudo.pdf
    • http://fw-simple.com/uploads/files/12346805943.pdf
    • http://myhomeinparis.com/userfiles/files/56610076088.pdf
    • http://kripasec.com/userfiles/file/gisifonanuxusutelak.pdf
    • http://heldermusic.nl/ckfinder/userfiles/files/kapifomasigetivelamumin.pdf
    • http://fjsxsx558.com/upload/files/34450653131.pdf
    • http://f-okinawa.com/img/tmp/file/74614954976.pdf
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/wunajibazeli.pdf
    • http://gyliver.ru/files/files/49667439430.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/gozawosute.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d058a435c2---39730974942.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+i+put+my+own+ringtone+on+my+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b860.bin
982ba15180e735679f0103e58cb71ccc6af83ed4cd8cf8acb98cb5a58ef962f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xB860 16372 bytes
font_01_sfnt_off0000e17e.bin
a29aec38e9a7ab4c663e9248f6c4ca83483f9797f4a3fc72a1a802ea312807e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE17E 10752 bytes
font_02_sfnt_off0000f9ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 16792 bytes