Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9ddb3330b3771c…

MALICIOUS

PDF

89.2 KB Created: 2021-08-06 04:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 07d7fffcfd67a3173a315c69381b13ff SHA-1: 4e340633a1c47dc94dfd647596c7f35b427e2087 SHA-256: bb9ddb3330b3771c8e695911fff5791a923f96b742c63687a9beada1cccfca57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and disposable domains. These links likely lead to further malicious content or phishing pages.

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 https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/282hn3qoo7ur1ptplfqu48tmrd/83931445190.pdf In PDF document text
    • http://mateuszkucharski.pl/admin/file/lezowiti.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/32010299022.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/susozudumilekaro.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/kipak.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/81306097464.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ajs42vm1daqe050230a49463ou/xobeb.pdfIn PDF document text
    • http://guowangcable.com/d/files/telasupagabefakixu.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/63298277418.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8fb2cf37f27cadc93b384c466ce6df19/raxalilekiwuxixenafuved.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/gulep.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/n1j7n3j44ukmo1d8jjvmi1e62t/59659707076.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c66fcfbd98e---kekixivigu.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d043e6ab8---dovukepalawamutawa.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b5b9444b---63121497440.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b938ba7293a---14526772730.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/959844412af753c511bf5fe27ea7449e/lazenabixeruzefusam.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/17346216944.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/71875675140.pdfIn PDF document text
    • https://sambelteri.com/contents//files/65860224536.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210621061238_zrub4n.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/sedizozavogamideragi.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01cd015bc2---99784387311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+are+the+different+styles+of+wrangler+jeansPDF 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_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 16432 bytes
SHA-256: 39b131cf9d97ecfce6ec2a8a79d31dfc298fc643f23d1eb31d190d2b4eedc24f
font_01_sfnt_off00012476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12476 10956 bytes
SHA-256: 47cd41b966b370c15b9c3a0df92770828eb3bb0f52c71bffb7c70a775b5f902a
font_02_sfnt_off00013da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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