Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cee9d4c90687e55…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 20:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f04b94923bb94bf9c52c37d4fbd1126 SHA-1: 186905971c76d950a999e67cfbad70114be8b0e0 SHA-256: 3cee9d4c90687e553b1a81110bb524fe8a7ccfc123db17bba6f02027b6d616dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=the+king+jr+ward+pdf PDF link annotation
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bfa962e29---88574076098.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210904173537.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/48540738474.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/pipaxanowoninidu.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/zubekesojiwe.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/vebewojijorimitiguxabow.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/xodizukozevijofiv.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132710d2833f---42900736081.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/zezeladebenegesuxivezoto.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3cq6f9tmtphp22vodjh4no5h25/40231059948.pdfIn PDF document text
    • https://duvanco.be/docs/files/zenovarojoda.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/96082390027.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/031258013398.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/fexovepi.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/31341551250.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/ximaburefikegunuxako.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/foduselegadobabivu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca32f4e1fa---miwitugozabarina.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/79681657158.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/15413669074.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/bufekojenulizazikotumogap.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161454ef8a9c15---sokanoxikagilolumelipaf.pdfIn PDF document text
    • https://gdaniec.com/upload/files/pamatuw.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/37170885203.pdfIn PDF document text
    • 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_off0000e61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 10616 bytes
SHA-256: 998185ef8eefc6eae134c01065ef45f273e9525ca911e216e75aa6dde3b9b96a
font_02_sfnt_off0001162f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162F 17364 bytes
SHA-256: 322ac77722c74ee4e63373973abfb8a3e7666e1b029766cc3fdfb7fe0eb95738

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