Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ed0ddcb715bcad…

MALICIOUS

PDF

79.0 KB Created: 2021-09-01 21:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a0c151d5ee65be1a930824efa08eae7a SHA-1: 97d7fcf4c7c675f4f85fd22c09de03ea20ff4b40 SHA-256: a5ed0ddcb715bcadb63c05180f59a4381daa048dfb2d0c89245cb68ac42012d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/mjcvomcdo7iiaa6teggbp41p6k/33716688855.pdf In PDF document text
    • https://angem.fr/userfiles/file/vumalib.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbaba60b443---87305297980.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/16453127518.pdfIn PDF document text
    • https://majubesar.info/contents//files/23509803464.pdfIn PDF document text
    • http://wdnederland.nl/file/wupiwafep.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/srp0uj1tdk2fba73dpoci69rj0/5761036808.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/jigesujobe.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/93746796847.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/sodinaziro.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/gutevazedepef.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/nfeksnm47mrcuhn1fa7b35uu6o/xipovekatozigoxaw.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/wejovis.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/jufimiza.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/xelozikofowuja.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/padufogapatow.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/komuvumiwolajisujedo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2f1b1837a02dc470a11209092242eb77/61136794586.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/82868556453.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/4931400035.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d40574d1a---nufugimozin.pdfIn PDF document text
    • http://acril.ru/ufiles/files/gozoxudizeselefud.pdfIn PDF document text
    • http://d4sontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/xutovipodazuxemojemi.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608c86f0af47e---mubinifufowipuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=upbeat+opm+songsPDF 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_off0000cf8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8F 17672 bytes
SHA-256: 614f7d3fce22c52683d845be2ae45169877ef06767c038af37b63abf2db71ab3
font_01_sfnt_off0000fc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 10504 bytes
SHA-256: 286e03518caedf533234e9b960f6a32a010eb7679f8658c3bf33d648e71c1511
font_02_sfnt_off000113e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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