Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc13aceb0aad2ce…

MALICIOUS

PDF

87.9 KB Created: 2021-09-12 16:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab4ace68e8f1f9154b4dd9f75644ffb9 SHA-1: 2ad9573261e1e73880578c02a161a5aed3197f82 SHA-256: fbc13aceb0aad2ce067b2e82b08f602f381ab1f0fa40a7e27b8dfb285d69bf1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to multiple distinct hosts, including compromised WordPress uploads, suggests an attempt to obscure the final destination and distribute malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://acavacecio.it/userfiles/files/fatiribesus.pdf In PDF document text
    • http://carscaso.com/js/upload/files/41372962613.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/94766477703.pdfIn PDF document text
    • https://aneri12.eu/res/file/4099371260.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/35521984157.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/68090555086.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/90314919808.pdfIn PDF document text
    • https://alohasafaris.com/files/17633760425.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/76626776925.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f44dd1fd6e---dimuvujodofiwikamitep.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/sazefenisafave.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed30bb108c---74826593961.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/guluzagararamunotor.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/bidoz.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/72802307650.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/56977189539.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/7508094612.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/fabaperutosuweropifofem.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/65639739737.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c315f41a8---79763392343.pdfIn PDF document text
    • https://preciseenergygroup.com/media/34538945876.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/lajomupifexamivalug.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/2de8525c2d11dc6b85d53993ebc25c4d/tavudopamasepasifuganib.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/43992483645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=different+jedi+fighting+stylesPDF 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_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 10596 bytes
SHA-256: ce92c17697269aae6d43ab1267e995e3bc748a4525813ddefabc0ad6d6067b64
font_01_sfnt_off000109a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BA 18588 bytes
SHA-256: ee74fe7ebfe9fccb3d8591cbf30176ccca1cae4b61eb97ab5a607cb12e3f64f9