Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7ae8a0ed3fba0b…

MALICIOUS

PDF

84.4 KB Created: 2021-08-25 16:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8e7ca9416870a9c7cc78d1587b637ad1 SHA-1: 9094389ca39521785c308e7d3461e7b205cc7d7a SHA-256: 4c7ae8a0ed3fba0b3425346cfd99bf18e9cd1c7b7809a9ad593e4eb0851ccc79
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous URLs, many hosted on potentially compromised or low-reputation domains, reinforces the phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/9ikinvbis1dsk3k32m4bgvpesa/geluwogik.pdf In PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/88740441112.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/bokugenexexazuviv.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/11192020954.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/46974369727.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/sijuvivijufojemagixew.pdfIn PDF document text
    • http://sowitech.vn/upload/files/pimunam.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/janifatokez.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/50867984926.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/37130778512.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092ee5f9a524---tapotaxenobikawix.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e68372536---5717932666.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-1/20210701182811609642.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/73205327722.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/7762622818.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2964c4c8cb---fogapofow.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/2630836288.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d69106c8---78725741071.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/65434031814.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c914d21de23---nufevisokawafufazi.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/4oqmr8jbk0hmor5tctfcnn11v1/14310093490.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/sevawomevulusijeb.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/lufuzupamatiwiluxadelexi.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/56975245446.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bedd95cfc5---rafefux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=a+wise+man+can+learn+more+from+a+foolish+question+meaningPDF 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_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 17768 bytes
SHA-256: bd3e21239a402cbc746a3542dcd72aa97d064019de8d29105f915c3d23252c76
font_01_sfnt_off000110c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C2 11096 bytes
SHA-256: 8599aa16c27a12aa97ce9531a9a8ff2670a768b0d85f420d3309d17aec7b768d
font_02_sfnt_off00012a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1