Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9ddb5c2ad3698a…

MALICIOUS

PDF

85.6 KB Created: 2021-09-04 02:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b96d4905fe9aad3c897404fbe1d4a25a SHA-1: c512c50a49aded321e19dce10d720de91d84034b SHA-256: 7b9ddb5c2ad3698aafca3dcad57c41db92b2ceaed25044a4cb180e122c8866a1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, including one using a raw IP address, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

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 https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/rugukuwigesaz.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8517d3484c---29205993120.pdf
    • https://numen-wow.com/userfiles/cloud//files/nojomifitisaxeritipaga.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb460d99115---45227067447.pdf
    • http://140.121.161.111/ckfinder/userfiles/files/vimiwo.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072391db8046---18738286924.pdf
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/kudimixarazak.pdf
    • http://fisioterapiasuzzara.it/userfiles/files/81130736751.pdf
    • http://hnsunnyfood.com/d/files/52750303235.pdf
    • http://bajcsidavidfoto.com/_user/file/xifogamubebinabojedox.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/730aec9928d99a07f722ab33ecf805a4/58869749740.pdf
    • http://12shio5.com/contents//files/jojunugunuzagotebado.pdf
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/sowewido.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076792f2dbb2---mefuxebuzas.pdf
    • https://mfdesign.hu/files/file/xaperuwetonivufemeruzidax.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cce06c0bf---nevarumejul.pdf
    • http://schokozentrale.de/idata/77959817395.pdf
    • http://niezapominajkowo.eu/userfiles/file/jakumevi.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/86929280115.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/s8svg49u0vs7rpa55abq081ego/31311415249.pdf
    • https://musikkursus.dk/userfiles/file/32175191083.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f376f4f811---83059170681.pdf
    • http://alumnicollegedelunion.org/clients/76066/File/pebawowomigetapo.pdf
    • http://abacusnancy.com/userfiles/file/wutejixeso.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=unmanned+systems+integrated+roadmap+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e771.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 16792 bytes
font_01_sfnt_off0000ff83.bin
70ed33d5ca96e959541fb892012d2b8a2a363defee48274df4bf7c96821c1777
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 18328 bytes
font_02_sfnt_off00012f4d.bin
8fe356c29132d1b5735d6abbb4ce96b9ca458c0ec3c6bba81a1363addc07d61a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4D 10916 bytes