Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3c6a779caa59f9…

MALICIOUS

PDF

93.4 KB Created: 2021-08-18 13:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8bc3770193fc8f4c2ff38eba04b78ff SHA-1: cafd535f24cdd7f77b3ab6abd6836a732e250775 SHA-256: 6a3c6a779caa59f9f4cc02a8ab353dd399ffcd807d3875b17a9d3199b6fcd31c
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially untrusted hosting. The presence of urgency and download button lures suggests a phishing or scam attempt designed to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081218339ff6---40975209892.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160708222adedc---tukiwulowawupipovidu.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/47447337926.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/jatefegudozebuxa.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/memaxasi.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/gibirurokekaxijabilonox.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210709105004.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dq25o8l4qsmhi4uj25f0n12ma2/nusatesulelug.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/7274068006.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/xebowowimanugoxudakiromis.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/35170059175.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/46954172103.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e48f3d542---fifalozinuzonebufasol.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/3lr9bojvupuv2ujjr3kpn0k0g8/fiwanesovatokal.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16102c43d7cf59---70799473300.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/mawuvutapimafa.pdfIn PDF document text
    • https://beaszemin.com/files/1914746174.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/fe669712b96998b3822844c70a9d166b/63226105863.pdfIn PDF document text
    • http://zxsolar.com/d/files/liromedibagojogo.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/zosawubidebofuripinojov.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6484f2acaa---37099064562.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/mesilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=chemistry+in+context+8th+edition+pdf+free+downloadPDF 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_off00010344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 18332 bytes
SHA-256: fc63b036147f0e870cecc141d94300dc51650e4f72994550b16a15a9b2b15ea6
font_01_sfnt_off000133ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FF 11428 bytes
SHA-256: 16aaacc10e650793cb60ad5f1f31b40c83bdf10ffcde62184b8420db6297dfa9
font_02_sfnt_off00014eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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