Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06e9abb454cd7fa…

MALICIOUS

PDF

92.0 KB Created: 2021-06-29 01:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0a9e242937062407aeabb42c8725f6eb SHA-1: 26fdeebe703349d5b1b157fdcfd6f5e9af285818 SHA-256: b06e9abb454cd7fa0f5d0edadd38d358b99c2726b01c0c824d2fcece10585937
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ystechpro.com/nbloom/fckuploads/file/lenugigominosexuwuvotogoz.pdf In PDF document text
    • http://sapaethnic.com/webroot/img/files/jaxejalixuxuxe.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8d7bb8aed---65770967322.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/riziburijeru.pdfIn PDF document text
    • http://barksdalereunions.com/clients/869108/File/81698343022.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/bizafugetad.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/4s8dtpjlsocbk8qref4lp2gno0/zafoxotokul.pdfIn PDF document text
    • https://aedwea.com/upload/foto/16401520121.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/zinafax.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607967f195c34---tuwezubobojomapudak.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/5000758695.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ed1ef38d6---velelupuruwanekitanupoke.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160841ce7ab244---vowuvesek.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/uljek6iomb7omoqt0sfiaas7eo/nutuxisubekimel.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/30168365382.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/golofomimapabowuribowixa.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1e0cbf353dfb62439bc15f3019ea34e/zanuwewinukanevikisu.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/difopus.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/50938437352.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/e0962aa2c1ffd1f8ebe2ddc87382b5bb/gepizexixagegawozobovikad.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/39b25ea5704ab4ce189d01b686e345fa/pafeziva.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/c2f4e394e33569a0c89c8d7549744a23/56997881284.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/bujapikizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=carbohydrates+and+its+typesPDF 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_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 10728 bytes
SHA-256: a07120af50fc1215ab164a33c2218506a6d53176de7e7019557b7387166e885f
font_01_sfnt_off00011f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F24 16604 bytes
SHA-256: 5395330b38ad3208d081e932313ad4c8e0a20bc2e1097a499ce748ec2eedc866
font_02_sfnt_off00014aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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