Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdd3fcd00966ec8…

MALICIOUS

PDF

86.4 KB Created: 2021-07-07 08:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7b48ac4809db0ed37dc93c3b1b22ba20 SHA-1: 238d18ce6b6e224203b4cee1e4b28362988072ed SHA-256: 4fdd3fcd00966ec8a4580601810f5e6bace81792bf5aef0e4befba89d46f5979
164 Risk Score

Malware Insights

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

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 various websites, including those hosted on compromised CMS platforms. The presence of a 'download' button lure and the nature of the URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • 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 http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b071690ea---setomafurasubuzulomari.pdf In PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/ce9f3485a34d6d9bc729f2578603b992/pozijonabugukovawuwo.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/lugubol.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/lh328dscc8riqc2sjqofmb70v1/faritugi.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/diresujofuwad.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/sepidobodawur.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/zawisirofogoxuzevakep.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/18452423764.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/afc0d31994d557a81424a5c03489817a/tipewixi.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/2c23f2cab280722359017614d048b5b6/fisejinusaluzelabere.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/2929cd67694e73cfc26dac825991c238/sovaje.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/ba88f522dccf5c19581419b6a0f4de14/mokumaxapeserifuwin.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42a1510f4d---57787882975.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/gamurenisefejogoteropikug.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e31209b683---dazad.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/kabusukinuloted.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0af3b4542c---14091330293.pdfIn PDF document text
    • https://brakos.it/file/vosemekuze.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f1f8039f---89630435254.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/kowevajibolaxojorapasizak.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bdd29d662c1---666626591.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05addc76d---badedobuzozolegonol.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/ledeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=free+fire+hacking+apps+headshotPDF 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_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 10924 bytes
SHA-256: 5e4bd7fff5ea3bb011a719114d659d6afca1d3f77bd542aa1db6f75bd1ad3062
font_01_sfnt_off00010451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10451 18324 bytes
SHA-256: 034fe669c61e9cdb769f511bb770d5d2a3edf247a538fa09310cea475dcc306a
font_02_sfnt_off000132df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1