Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68b9721544afbcf…

MALICIOUS

PDF

77.5 KB Created: 2021-10-12 05:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3eadf6f24de8bdaf0a236bd5d61590fc SHA-1: eacb14db5ab19ee23e5bd1b7516d983ff2e3a88a SHA-256: a68b9721544afbcf999e7eb4c6c232d2b3afcaeb36c5ce72c5a003e0732abb49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or are part of a link farm on disposable hosting. These elements suggest the PDF is used to redirect users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://fishuntpesca.it/file/66311190929.pdf In PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16164a9cf787a0---53550321954.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/73051048258.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16158faa5ca2c0---44172121395.pdfIn PDF document text
    • http://apart1day.ru/file/mogevoborarozamelu.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/zumun.pdfIn PDF document text
    • http://perksys.com/userfiles/file/koxuletazogefifimizegiju.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/lowesemizunirotofed.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/durokosevadokexe.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/diderojefuruvem.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090105200120.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/dogonofeniv.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/scf9cevlq0v3usso01fm9kvhk1/livojiguzuw.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/14383950945.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/23448471150.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1408ed679b479fe2d3f046c5d36d4bb0/somono.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/6146559316.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/66910084300.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/gozefaguzotov.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/qrk6pkhihi4hor1g31bllv4f25/74711615388.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/95415155497.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/nijataralapenaxezokiwiri.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161580c433582c---ziguxa.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a65244732e---tijokurikujanaperixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/D9plVHj2VOU/uplcv?utm_term=engineering+circuit+analysis+8th+edition+chapter+3+solutionsPDF 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_off0000c6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CA 11368 bytes
SHA-256: 329436e4ce4f999b9a2779a1c4fa3337b72c4148d002c37ae594177d930476da
font_01_sfnt_off0000e15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15F 18208 bytes
SHA-256: 20f8191319aa94697a318bb0a35e0174805804fab4fd583c77d7bc831abb70bf
font_02_sfnt_off00010fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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