Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30468a43cb4e3ea…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 20:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9753ea3e7796e84210ea85c2ae6c8922 SHA-1: a39eb3b9aad67b10ecedaf41596340afc27a6304 SHA-256: a30468a43cb4e3ea947eada199d92b5094ffdc2dd894f9ba852c4093f0564b4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, pointing to multiple distinct hosts, some of which are hosted on compromised CMS upload storage. The presence of numerous unknown URLs suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://grupopiscis.com/upload/files/85435089357.pdf In PDF document text
    • https://smilaxlabs.com/userfiles/files/repunudotamufida.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/sedizexolomugukagekaxuz.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/19920455989.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/41cc4b50e776f02d8eefdb5b7f388ac3/davagosezono.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/mananude.pdfIn PDF document text
    • https://ubranni.com/uploader/files/purulujilevawewipaji.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/73502881251.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/94825660372.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/42618617328.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/47801957660.pdfIn PDF document text
    • https://mimpishio.com/contents/files/xivogupifij.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/regeboni.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/60601325627.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1fd82ba042881af160a83048baae71bb/86664078063.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/47263622249.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/32765393632.pdfIn PDF document text
    • https://emenu.hu/editor_up/79417677172.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1d7ad80cb---volorutupefeboma.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/49863202771.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/59598261225.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/pesipap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=quadratic+equation+calculator+with+graphPDF 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_off0000acc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D5 15856 bytes
SHA-256: dd2199646515af5176b7b0f45197aecd4d09ca0931050caa3437006f5195a42c
font_02_sfnt_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 11016 bytes
SHA-256: 91739aae602400ebd9ad9e01ef4de96d2fc04d5ba8f81ccb2d133dd8aa262f88