Malicious PDF — malware analysis report

Static analysis result for SHA-256 4366f29596c38830…

MALICIOUS

PDF

77.1 KB Created: 2021-09-03 02:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ade9472361eff13438df189540d59bec SHA-1: 03ac32505bb28aed77ea6d361d23c6cbc4f84e84 SHA-256: 4366f29596c38830e6e0f0f39b9bf3dd29f4d348a6951c32d7c76cc835b02db8
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://agnieszkapawlik.com/userfiles/file/pubidetumadaduvadaxode.pdf In PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b37190cbee5---14213419861.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/kudobekodimamawesam.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/zupezirafi.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b9afb9d48b3f116ead96d27cb97bc261/29301758993.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/n45iaiqmdu4a7j7ehpbp6f13c2/nezaretig.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160881aed5cd64---19876846992.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/99684526369.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/4521065002.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/v2ogs0f1kkvvr5fbel7to9r0gt/samufenoxuvu.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/geziju.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/nudex.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/10580124297.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ec8fa0a147c8445e9491ff4265f7619b/4830993983.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f68e3566e3---38552311171.pdfIn PDF document text
    • http://health-bridge.in/upload/file/28260379160.pdfIn PDF document text
    • http://ddrwc.net/clients/869849/File/69248956168.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee453ca5b01---wekak.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210710190654.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/76937979859.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/miwefawugirotuja.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/85614574478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=eenadu+pratibha+current+affairs+pdf+downloadPDF 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_off0000c0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DC 19468 bytes
SHA-256: 2d93040ea0ebb2878bbfb17978e2a773769e2ffc458e18530fe4d9b908aa5ee3
font_01_sfnt_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB6 11028 bytes
SHA-256: 72bd96fbdf5ca40a1ccaf9de350a17cfe0d339e443208e596f96f4e4d551b054

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