Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4b4387101c46bc…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 10:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a5bd52d8d747b7a5baafe2f3502adf6 SHA-1: 4d86a8a384dd8a21907fb7f6dd8ea2c315eaa5b8 SHA-256: ed4b4387101c46bccdb06b7a4c82cc85bc331988010ab6c8a1377f930beb370c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to link farms on disposable or compromised hosting, strongly suggests a phishing or malware distribution scheme. The document body is heavily obfuscated, but the heuristics indicate the primary function is to host these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=watch+heroes+rising+online+free+123movies PDF link annotation
    • http://signauction.net/userfiles/file/71891286831.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/k828d9ph9taiioo10q7u3ffqnt/wubalopewetuzamokom.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/10972143161.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/boralajemewela.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/vufusedejef.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210905140731.pdfIn PDF document text
    • http://infunplastic.com/d/files/xopupopoxefotirirazorepa.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/firenudigomabidasasam.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161398d1118f6d---90686056034.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/timiroxejifosutofawobu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-8/20210908113656830775.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/72944553995.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/tevizerotifip.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/73800601266.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/tunaxoz.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/nodaviziv.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb08ab9c6f---88987434129.pdfIn PDF document text
    • http://surestegc.org/documentos/file/bozufugorokeweziganorizum.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/3331437477.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/13657674577.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/tuzufanivuvuzuve.pdfIn PDF document text
    • http://belniig.by/public/file/91011351977.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/92490711146.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/71077822655.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/65365474470.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_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 17412 bytes
SHA-256: 25973ff65b0e97884df4c98c10b90600e8662e08b5ad597ad4a4fcb78a9b9797
font_01_sfnt_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDE 11184 bytes
SHA-256: 635b5caa5ec8416610d6e75a26e52f35a2cce9a5dedb1cffbfac3d38e724ec6d

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