Malicious PDF — malware analysis report

Static analysis result for SHA-256 45304acc28075673…

MALICIOUS

PDF

76.8 KB Created: 2021-09-30 10:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee0822a3d51c9ed67a5995f5d3465b52 SHA-1: 238f3ffa47a43a728becb906d08da7e5aef70893 SHA-256: 45304acc28075673c02a4f86f5eeae75440b10e7ad46af550434b53a1766227e
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm intended to lure users to malicious content. The presence of external URIs and link farms strongly indicates an attempt to redirect users for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/6qt2f9drmukbc57l8urj2ngr87/zatilerujotunodusebu.pdf In PDF document text
    • https://ladangmimpi.com/contents/files/64743055519.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/nelevijalilarekaxemewidi.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/7659222483.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/xefewipukiwapafaganawijo.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/sorogoguwezipato.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/75074046215.pdfIn PDF document text
    • http://hnyinfeng.com/d/files/64118438944.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/54203069456.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/dijepigotubasux.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/28303294058.pdfIn PDF document text
    • http://sampleshipyard.com/userfiles/file/pisamaka.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/69816338188.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/77484336219.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109040528436620.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109031153293297.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/40859510786.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161534ed8bc021---wosagesakesosefuv.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/tegoxixolizunexelul.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/tenadetenip.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614dbdf5d4e16---97070057896.pdfIn PDF document text
    • https://sokole-tps.pl/userfiles/file/69246827730.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/zuxebuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=install+supersu+apkPDF 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_off0000c435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC435 10176 bytes
SHA-256: e8dfa468c9eb89cb10bb729b4ba7fd6fa579a1dd95d69b371fb82bb9f69023be
font_01_sfnt_off0000db2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 19264 bytes
SHA-256: 02813ae91a1f636bbf5bcbfa4a6897a8ba8ba22bda83b6ab912831d005e77ceb