Malicious PDF — malware analysis report

Static analysis result for SHA-256 e088508be8839656…

MALICIOUS

PDF

82.4 KB Created: 2021-06-28 15:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe817cbbf740eb0d0755ab568b8d8218 SHA-1: 0349330930cecc3b3a4d8247f5312d3d073506ce SHA-256: e088508be88396564eef511580015ad1b80d4688783c114bf8413759543e94d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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
  • 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://oniceh.ru/uplcv?utm_term=the+athenee+hotel+afternoon+tea PDF link annotation
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbc544f73d---wazutesiradilado.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/bixekipiguvukatino.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7627bd1ea---63785306737.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/ziwozaveko.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d1c14cc1ce849e697bdb18a671a86389/kozovivupubuzo.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/3170c189f5f30e1251b0dc3d54de1e21/mogepon.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/136e74eaedc1be43639acd4c85b7853d/40976137353.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5f9eeb6214e11670326b57ee10e816c2/49200002469.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d45aec1c---16408662323.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/nodivekuxunof.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d328954fbdf---81766508547.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada66c56b20---41633117244.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/napokeku.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/43900466675.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/rutojebopigirufokibufuped.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/6603d658e1ffce56b575f482a5d84625/posewevukop.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/gelelogidetu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6fb670d72---vagaxevanid.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/168dff722a9c76e426fecae9e865190e/75631769103.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/66be006470f7ec2a70f936d5c34aee86/10381313891.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608556627d649---94650935847.pdfIn PDF document text
    • 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_off0000e023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 17640 bytes
SHA-256: ed3cbe913790532efd073e9aeb5af506b2d10d4464f149581e61b24e4c55d2f7
font_01_sfnt_off00010e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5F 10016 bytes
SHA-256: 80c48d08453c807d3b6f6b419cafed940293eb28f1cf685e200888c1b73e9128
font_02_sfnt_off0001248b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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