Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71c906c1a33e8b5…

MALICIOUS

PDF

89.8 KB Created: 2021-08-03 00:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a755b1034ac1c033ec98c98b94c6bca SHA-1: 088f876e3d723c4335f101265317a1f473b55614 SHA-256: e71c906c1a33e8b5517a4e9602662213b4dbc322bdc70175e23317d9a7f6532f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially harmful external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/2d1a5401ee03acf7ef15e09211c91dc8/34007593667.pdf In PDF document text
    • https://ewastexperts.com/userfiles/files/dulenewagizutew.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7788544f8---42963482600.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/pirazeruxutitaroba.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/nekul.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/cd8394d4232e9cf61ac25b229582dd48/jakuzimibe.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607815cc792bd---34508246280.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e609c390---84813549389.pdfIn PDF document text
    • http://www.bash.cl/media/file/2050142311.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890b9505b8f---demunidagoki.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0545ac3e38---41205781454.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/janedikobina.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/62293537897.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607df226b9638---pibapiporonexisote.pdfIn PDF document text
    • https://wita.lt/images/files/jiraborareni.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/gixejakimim.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/xuwetokawowagifeje.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tawabizusazefa.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f7d0302c8b623dcd4ecf2861e41d22c0/lebukuluve.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/fifokimobaxuxeva.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8b6fad119---50551102536.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/d431b0fd0f9a5c798dcd8a2b5ba2b220/meretajojitejine.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/sutoxawatavetakurarovavog.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfbc25eb7---34092464439.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ea8a9c2d4---wekuzasavavarolaveluxad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mortal+kombat+x+controls+xbox+1PDF 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_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11019 10548 bytes
SHA-256: 1ba25db11ef961d19521a52210e2b51e583194215369720476faf52a1a9ceee6
font_02_sfnt_off00012842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12842 18552 bytes
SHA-256: 0041ede62998a717f3feb2ca8dc5c2fc7a16b0e04aec982b31e50fe60c4cc283

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