Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fdb7278178707f5…

MALICIOUS

PDF

131.0 KB Created: 2021-07-02 23:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e7eedb3eb851ba06c23f4b7124399306 SHA-1: f310dde1c37efda5bbee1b6812cc7cfcacbfb729 SHA-256: 1fdb7278178707f5acbf2609e3927696d9644ebf2a088197dbf54b6b0caee6f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggests the PDF is designed to lure users to malicious sites. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://cvsc.co/userfiles/file/43038084759.pdf In PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/tunanuwilap.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc413cd878---20456371038.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc6557f50---20489281620.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/62156575591.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/31063274256.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0ib90io5cqf75coud75fc1b3h0/84510957190.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bacb6cd2d7---rewaborapelufetijiwojunow.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/panadunefexerux.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/32638158706.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/bmn5e6rg0qsvcho8s72h69pcv3/66728859323.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160792c6c9866a---losatulad.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/e631522b65bb8d59155d2ddd0a3a5ffa/5051637632.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/48690729054.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/sevuzulanuxekijufu.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/wasukimeg.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/zebutizutabewemanoregena.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/jokasibibajefetuwob.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/97649196446.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/8f67f900ea2775bf9ada6427ecf13887/didumetufo.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e61201417a---xarovupasogajusunakuvib.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/kokepar.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/55949163071.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/c0a8sfmb5hbeub9spr6m448s1c/ligakagifibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=important+events+in+the+catholic+churchPDF 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_off00019dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DCC 18588 bytes
SHA-256: 5d859f3796329bcc0f7c06f22cccf0869a3a9640fb6ad735331eb5803d5caa43
font_01_sfnt_off0001cd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD7E 10756 bytes
SHA-256: 2c7387044578e0166bb917441fc49ec6c2a24790df57662693b6b416e6c5dee7
font_02_sfnt_off0001e60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E60E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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