Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d720c98a88551d6…

MALICIOUS

PDF

80.5 KB Created: 2021-09-02 17:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81b35fb8a7b93bd16964d352ef232bb8 SHA-1: 3f5be47eed245161c8e9a6487feab00d13a85d20 SHA-256: 5d720c98a88551d6598f0ca45a30a795da6753f7ec5915ee396447b3f4c3b54f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature. The primary attack pattern observed is the use of malicious links within a document to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4515

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f90e77f9---burepifu.pdf In PDF document text
    • http://metal-test.cn/upload/ckimg/files/202107300828415931.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/p2fboe6kvb32kv1v60a7bl1dk0/rusuwomivariwinojolojopu.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e14f394c66---fegotitenumazupiwut.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/19134838518.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/risopafa.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d93a22e82fe---54809635218.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/bamusewejexaxofegujaxu.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/79076350799.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/jenafog.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/32283967339.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/kugokababafiralugevino.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/xanusabuzixogoxoju.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/7ug32ep0qf13bqan32p4l5ddev/xadurula.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607026e0397fd---kolowededuzasasoseziwe.pdfIn PDF document text
    • https://globalquestconsulting.com/userfiles/files/rosulezososipe.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e3f0cfc37a4647baf33271c534c67be9/xezatevodiga.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/bujubipivolavapu.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/84866228951.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d82e306d1a278449a2ec403208a6776d/10064999587.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adc09cbbf72---zezosixemezoneku.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/32941715095.pdfIn PDF document text
    • http://zgic.ru/!upload/files/fejevirizaxuguzosipewonej.pdfIn PDF document text
    • http://riversedgefm.com/files/file/naxeramejov.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/kapijib.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/27569889858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=volvo+xc70+2016+manualPDF link annotation
    • 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_off0000e456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 10548 bytes
SHA-256: df4b6b0063d6eefe2ca2a83495de8ca0e29cf41db49ee7d19d9f6cc3acf83e0d
font_01_sfnt_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001149e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149E 18164 bytes
SHA-256: dc3d932a12788af759e1214da6fded41d964cff534e328cec57134331e3436e5