Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9e1c321dd27b68…

MALICIOUS

PDF

93.5 KB Created: 2021-09-03 00:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a7cd8191ea6ed8637876ac7558cb069 SHA-1: 635f5dfbc76b511bbd25602c204be4765352b071 SHA-256: 4f9e1c321dd27b685a36ec332459bf8ea4615d273aeb79be20a3eb10e69d81c8
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of urgency language further supports a phishing or social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • 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
  • 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 http://m3hotels.com/userfiles/file/lenopuxojesa.pdf In PDF document text
    • http://brianhaymore.com/images/e/file/11768084849.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/zopemop.pdfIn PDF document text
    • http://hkacca.com/userfiles/galegimupibelemag.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/fufuwogebukotemixo.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af15d884d7b---luwolivoz.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128d56a28a54---tosipukebeki.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/newazijerixinarateridiga.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/gelorukupenuj.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/pomawumojot.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/xeguvugixijo.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a0417675e---tibifibixodagepifidise.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/nimegolopotapugofizusifo.pdfIn PDF document text
    • http://peoplefineart.com/assets/202108/files/20210810201823346389.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/13303313040.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/70771780491.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/59551367479.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/dafajimilixilumetar.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf665fab3---74678131728.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160810b664b1e0---29680608059.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/6plvr8u04ghkiiasfqtpcuif1i/tegipov.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/momidu.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/2dc4272ee996da7d5f3555636ae9c59f/dibowozutidovepumemopi.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceec54edb1---pigupaji.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/3082285959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=taotronics+desk+lamp+manualPDF 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_off00010162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10162 20240 bytes
SHA-256: d7c93ceeb446e6b0f88f4cccb7612ab3a62cea342f8dfdb27aaca6d784339065
font_01_sfnt_off0001370f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F26 10832 bytes
SHA-256: 646fc66aa73504de696f658ec00e754e4359cd67f1d5bd7e05038a8340a46a93