Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3a30be9c08e634…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 22:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06d315cdb2b45b6556aa979c043ce755 SHA-1: 6189b790756935218571a5a8baf506c8bcd901ec SHA-256: ba3a30be9c08e634c38017ab9d915c365c9f89c2a870e1ec6304714cb73c0821
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=android+q+launcher PDF link annotation
    • https://big-affaires.com/img/pics/files/borurimidoxibojojika.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/nanupatopebaximuliz.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ami6qq1sc74op8qgkvggsdr973/7553917416.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/nufavevujuparixopovejusog.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/wazuzexozuzikax.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/55567428039.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/28408447255.pdfIn PDF document text
    • http://innotack.com/userfiles/files/5103467376.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/tinofedazu.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/pizodegovigupexaduxa.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613303d4b25c5---daragogukoje.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/58753642387.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/mumiwonoxisomojego.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e76949c31---voxejivaredufapukugulopa.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109011656391757.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/tulujoson.pdfIn PDF document text
    • http://cosyromania.com/media/file/nebawaxadimo.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/weduribadexipexug.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613416092656a---62341733402.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/mifoj.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ade0e4a05f8a1a3a353746b3062b7728/vofeni.pdfIn PDF document text
    • http://unseretochter.ch/images/file/82901867316.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_off0000d738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD738 10428 bytes
SHA-256: 574139d3b6420957e4de4e8e5619742cb0c2d506d90bff3529a951d49b91bb3a
font_01_sfnt_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 18868 bytes
SHA-256: 5eb9f651ac4d32e1814c3edd969f6aa0e9aeeb948b74f9751f47b40eb03aabe0

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