Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba96e9f170c86cda…

MALICIOUS

PDF

82.4 KB Created: 2021-09-23 02:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f2ef3e1a0625094994056de89f55bc99 SHA-1: 91528918ea280f12877238bf9af3aa2ee017a7b2 SHA-256: ba96e9f170c86cda2f2e3f52c6c854184d3062a27438dbd84cdcc82f20703da9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address and others hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates a potential for further malicious actions, such as downloading secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cropscipublisher.com/files/upfiles/file/2949371971.pdf In PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/fefamidimegiwofe.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/kakafu.pdfIn PDF document text
    • http://reopen911.info/media/file/1100521730.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/3475632956.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/lobumujeruxegomisime.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/15368977026.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/25410255023.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/valisoxelikulis.pdfIn PDF document text
    • https://hotelcorona.ro/files/vewuko.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/99526535387.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/dopobopamegatun.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/27009173155.pdfIn PDF document text
    • https://windsbs.biz/files/file/tezevopan.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/58354641249.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/gazukarijibesiwoka.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/e1f25ddf7c6e771eca02377e91f5aed0/57154052318.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/35568859991.pdfPDF link annotation
    • http://studiovalentini.eu/userfiles/files/dixomapipumoduvadavip.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161489ad969e4f---mimexulekojijawaretigul.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/fuxalodetog.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/8mo38vcdov22e84rldtp3v325l/62740321325.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/duxoliwelubupanaxefef.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/gosuvalatutijewoxofutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+lightroom+pro+apkPDF 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_off0000de73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 17312 bytes
SHA-256: 266a379d0b43234f56cfc423ed055ca7d09aca70cea905a285419648500d5169
font_02_sfnt_off000123a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A2 10716 bytes
SHA-256: 994f597117d04c3f2bec603d91e84a88756973d3a02292ae3c657e3ed3a2edf3