Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae38de19783a226…

MALICIOUS

PDF

79.2 KB Created: 2021-09-28 07:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ea5a914d9fffc9ddb97cd72f5391a1b2 SHA-1: af6598900a361fd71c4fac13a8f8c46b48bff5c6 SHA-256: aae38de19783a226f5482c5641eab5cb2ba92dd7d0ba62f9462f8430974499a5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of numerous external URIs and link farm heuristics supports a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://ronaldtan.nl/images/photo/32315012998.pdf In PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/ninolelikilovolaror.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/pamiwiji.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3d5404b4bd58b48840b1728fab29fdbb/pobisobafivuwas.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/lumopuwiwupuxi.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/6823335810.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161519a700af28---93822015161.pdfIn PDF document text
    • http://chengzechem.com/upload/files/29066623120.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/zosimabezuviturufarepog.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/molof.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/83685656227.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/627bff76ac078d764f8ffde006e3bd3b/47257780946.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0417314001630567203.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/95354636174.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/pukor.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/susiboxexulo.pdfIn PDF document text
    • http://hadt.vn/upload/files/latusuwetomoted.pdfIn PDF document text
    • https://harom.ro/files/file/nonaximetudaxuz.pdfIn PDF document text
    • http://erictex.com/ufiles/files/19107864923.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/nadub.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/vesetebixil.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/501109cf5ea5ce257bd43cd1a86e31ff/sarume.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130415038e7c---rufarawezilo.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/26779332518.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614d83eaa584c---sarabugiguvimoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=erwin+schr%C3%B6dinger+model+of+atomPDF 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_off0000c614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE26 20464 bytes
SHA-256: d7fd9f4de647a789d3d2d5621980eb58f0d4794aa7fd8e46fac2e7e14f1c39cd
font_02_sfnt_off00011393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11393 11208 bytes
SHA-256: 9fd8cae0508069b28a263ad725f62830a041bff6821d7d6b22f98bc534126cdb

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