Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98aa5017428cd4b…

MALICIOUS

PDF

110.3 KB Created: 2021-07-05 20:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 12b317ab886280444f7009065f4d2730 SHA-1: b57fdfaba84d3823b25858d8c6b76af91d0e6293 SHA-256: b98aa5017428cd4b70b7751e6c829a718634b5c997d84f4f2a56f704f79c14b8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised websites. The presence of these links suggests an attempt to lure users to malicious content, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/d035ba147c2017fba586834b3d4eef5f/ginevadusix.pdf In PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073714c35cbc---23184685553.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/50891608754.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde9079e24---18179132149.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071bafc20cbe---bizijafajujamasototejuni.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a258990ea8f---10730617286.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/5dl2gsss52i96pt17j4etnooul/gogirof.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39b6058282---6393087910.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/favatomewepuwom.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769fcd20ef2---37966475901.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/fb362376a310e65606cf4692f4df5cbc/budanomubila.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/kojulokixofojitarukiv.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/epghofv5li5bd2nmjp05jrpdvb/nabesoz.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d962c5e4a7---93606253576.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/35847711137.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b17ec9362---tasujos.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/nikupa.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/welemilo.pdfIn PDF document text
    • https://csn-alliance.com/data/files/21701788579.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/vetug.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608825d399907---34377520107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=rajasthan+history+pdf+in+englishPDF 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_off00014ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB1 19092 bytes
SHA-256: 1f529bbb1cceeb74a213b357678b8dc3a16b3d163511c3d70e27a1b24060301a
font_01_sfnt_off00017a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A77 11064 bytes
SHA-256: 9e089407ddbc7b028f38e25551d88685000055a2433a878299b49cac370d1c92
font_02_sfnt_off00019400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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