Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f22d30e73fdb0dd…

MALICIOUS

PDF

69.7 KB Created: 2021-09-22 20:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ee7243d64c9d87b037e09633bf006b9 SHA-1: 6585ce441cc535b4083ced449d5db84379fae100 SHA-256: 4f22d30e73fdb0ddfd51e39af067e734d48bb96b6abd72172e365029715a43a9
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=free+ml+skin+hack PDF link annotation
    • http://mayinmaunhat.com/upload/files/vagilijijevisisarutezajo.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/xepisinoluz.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/judagemadedezo.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/roxor.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/jusedopexoxenumaw.pdfIn PDF document text
    • http://ustunongel.com/image/files/wefiwijire.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/14080788423.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/nolegoposixajomod.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4435bb36c---kawebekafa.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a5c8913378c81817be23bbdf16b2e88d/pafobe.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/piluvalatopaxikipewuvumi.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136fd1cb9e34---gagiruje.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/kukuzutajilidon.pdfIn PDF document text
    • http://abwessex.com/uploads/files/saxajajabozadopokuze.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/nibolimuzorutuxalo.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/dawokisetalutanenonupik.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/55049331655.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/10245127884.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/40031083285.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/99175119692.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/3332599236.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/lezed.pdfIn PDF document text
    • http://lagrupacio.cat/file/12793269142.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/50735605769.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/fejosogofuzibuxo.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_off0000b4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC3 10348 bytes
SHA-256: ed19c2fe8b91bf402130197960d965bc97debad44c03dee5b996cee5296a33df
font_02_sfnt_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 15072 bytes
SHA-256: ecdf4aad2322e30ca467343f304801d26d654928fbc58a1babc08f97549528a1

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