Malicious PDF — malware analysis report

Static analysis result for SHA-256 731f27b83651beec…

MALICIOUS

PDF

77.4 KB Created: 2021-09-05 19:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e53570ec7af7d518f7c99014170bce93 SHA-1: c71bc22b78b2e97443fb80c2bf0676bd758540b6 SHA-256: 731f27b83651beec4c9c86e9a97c6d96f25a4ff4b32cfcc7ac4665cdc2e31ab8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many pointing to compromised WordPress sites, strongly indicates malicious intent. The ClamAV detection and ML classifier further support this, flagging the PDF as a phishing or malicious trojan. The embedded JavaScript likely serves to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/7127jekatalb7dgdmv16q6vm98/15038975538.pdf In PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/7a943b5d2653bd582147a76b16f73bbd/xuvibinovimorejebepojof.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16094570f04c98---72649283883.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/c39ms85nuq4m4th043lnq1q0j2/28474957585.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/4857825152.pdfIn PDF document text
    • https://stopserv.ru/files/file/59074319556.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f1c19a034f---voxibuxikiza.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/f947deb1ba41c0f27e61cb496e30e208/puwanifumotofo.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/debuxozorumawejujirake.pdfIn PDF document text
    • http://napiarsaigh.com/images/neniloliwutidogur.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea7da8dfec---dafowukuzikitenofe.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/60163217661.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/82901876869.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089a67a16ba8---66587914229.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/86412608853.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a88c1a2f54b---xewajurofaxisekumu.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f7af8149bb3---mukinirukeximenalozawe.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/66576923147.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/91951852640.pdfIn PDF document text
    • http://bakoca.hu/files/file/vovumudewatikepegam.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c37bb61d7b3---rupuke.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b605df58048---81836442347.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/35750853654.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/zigolotujok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=elegy+written+in+a+country+churchyard+poem+pdf+downloadPDF 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_off0000c72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 11180 bytes
SHA-256: 55947c84ef14bff4762611ebcb42bb8ebad502fd0ef35a15deec7a3b0f01a140
font_02_sfnt_off0000f90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 18192 bytes
SHA-256: 7a23848b0fd8ce9c386bc236d3a00c9f109fbe1fe1961ac087c7395798b99bef

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