Malicious PDF — malware analysis report

Static analysis result for SHA-256 4293ee5c5d6a8b42…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 00:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c26cb337a50fb629f352f5ed075d3ebd SHA-1: 7cccca300ce91af9e2fec5f12dc922fc33cf22e2 SHA-256: 4293ee5c5d6a8b42e643b99dcc07be8125b2da6f71bc5c1cdc42aff39360bad9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to compromised or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://takarasushimn.com/userfiles/files/94294133744.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095f867c926f---tavugimo.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/mawuwajixexexaxa.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/zovidobog.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0da3f260---18252659981.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/firilejukekakowatozabova.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/47805245865.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210510025734731.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/71115871476.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/29940390361.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/s78ou01u0b2tiq9cvq2am1bgpm/vamedakeraberufakofo.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b66c591df8d---33946967698.pdfIn PDF document text
    • https://fobh.net/userfiles/files/83642791864.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210901185058.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/34540498593.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/63d4ecfe68677fae557b14e3c66752a4/2831389811.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca120ac3df---9263334068.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078bba83bcc7---berexovisedom.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/f731o9mdkur8uq5m2fh6lva2p3/mexegigijalevufiwis.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-8-23/20210823201234490731.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/lekebole.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38d5ecf320---78103270030.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/74a6bc5f46798b170e2f519d35790cec/28297714640.pdfIn PDF document text
    • https://agatanorek.com/files/file/55899221333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=eritema+infeccioso+tratamento+pdfPDF 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_off0000dda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 17924 bytes
SHA-256: 648fe4fc3f096c6f19652dc2cb5d2c30ad982763857701a925c9f5f006f0bf53
font_01_sfnt_off00010c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12461 10720 bytes
SHA-256: 3debc7cb379e78f98afa5d78b98f3b7a8e221190ea1e39d400e8cbc33c8ebf05

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