Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce99b9fa820fad4…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 19:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 758ed939680034dd4af485383c9a3bac SHA-1: b434447e21cea8a4c7008ba7bc23ab661fa10eaa SHA-256: 8ce99b9fa820fad40c3d3da4d03276664565abc4772f1ef52ba6ed9748d3715e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. These links likely serve to redirect the user to phishing sites or download further malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://avistravel.ro/userfiles/file/xujetawanajupezezer.pdf In PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b934421866f---21177717740.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab097b7ce1a---nodomune.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/48866181666.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/wixefotimuduvuwukurij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c032bfef7---tivemazetuziburib.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/8710325368.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/luvapugasapekipibulazatan.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/karivokisajoreniwaxowu.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/96259872702.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085df625433a---96062097742.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/9752272779.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/minebikifojidusuxiwipugu.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/buwodasifo.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e76ce4c49a---gidov.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/9275353897.pdfIn PDF document text
    • http://vkts.se/userfiles/file/21203346635.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/73724417738.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/hovegk4c3timoe58aul6vvt094/38895996542.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/20174316030.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/57736042325.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086bffabb834---fuziposumonazinu.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/95356841939.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075385c9c32d---xomuxatosubulaxigagesoke.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccab7b5fe2---58712024280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=time+table+management+system+project+report+pdfPDF 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_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 11308 bytes
SHA-256: 285cbae56e3e127de1721f627624a05cba3924f310d59ee9128b354c33372ded
font_01_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 17388 bytes
SHA-256: 7fb7590e6edcb3c722cf280ee07879ac98de82d4de36b5e7792b265e983af3f0
font_02_sfnt_off00012257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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