Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef1f900c2d3e7a6…

MALICIOUS

PDF

88.4 KB Created: 2021-07-08 04:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 669cae118abb711bce4f64dcc07b4b70 SHA-1: 8330fc43a9867f5acb6a42da4e187bc8c5c93972 SHA-256: 1ef1f900c2d3e7a60375115fa27c07ea75ff0f8f907b3469bf39e40cf3d2e26a
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF viewers. Heuristics indicate it functions as a link farm, pointing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, suggesting it's used to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://maychamsocda.vn/images/userfiles/file/3280925301.pdf In PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/99075811192.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/b2cv9r6tmi0ietc0k44m91ctn1/88267876865.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/favulijupukomepizoz.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73870ca742---gemavusur.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d3ca7b77---vanubojonogilewatumu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/n4qvo06b8gg2kdv8bp5e0f7ck6/73741701571.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834199b4b4b---zupapojufufadoragimofan.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/535f6201f85b7af6022d1abd537a995a/budojutimibobixuwi.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c2ee8ab47---wojumexewaduga.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/naguxemowufeziz.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0c8d98bc0bdb2a536af04ad492325a69/22278833806.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b773018f2e---pufejoso.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/93bdaea0e0a8fd97be46c047728e399d/94012256475.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/moxopedejubij.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6ed107889b82fe61457d60edf47ec7b7/51242416280.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/mozapiluxuvuvibileg.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0d2bbf53---zazuwapuwefi.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/nizimomubedukelik.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/bjjslmhr46vsj4693rjgpi76ue/20518056684.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88844f7e9---42496700371.pdfIn PDF document text
    • http://flgr.ru/files/files/28468946364.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/73436920866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=red+wine+and+colaPDF 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_off0000f5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 17740 bytes
SHA-256: b6b7db99fe4b11e928716ccc3f71afd0aee9448e85a7457770d47dc2b09f4755
font_01_sfnt_off00012479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C90 10128 bytes
SHA-256: d2bbfa2320c3c5992d8cf2dbb269e40631b896d2487b57f8febb00b1223a0f2b

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